R

race - v. to run; to take part in a competition to decide who or what can move fastest;?
to take part in a campaign for political office; n. one of the major groups that humans?
can be divided into because of a common physical similarity， such as skin color

radar - n. a device that uses radio signals to learn the position or speed of objects
that may be too far away to be seen?

radiation - n. waves of energy from something that produces heat or light; energy
from a nuclear substance， which can be dangerous?

radio - n. the system of sending and receiving signals or sounds through the air
without wires?

raid - v. to make a sudden attack; n. a sudden attack carried out as an act of war， or
for the purpose of seizing or stealing something

railroad - n. a road for trains; a company that operates such a road and its stations
and equipment?

rain - n. water falling from the sky?

raise - v. to lift up; to move to a higher position; to cause to grow; to increase?

rare - ad. not common; not usual; not often?

rate - n. speed; a measure of how quickly or how often something happens; the
price of any thing or service that is bought or sold?

reach - v. to put a hand toward; to arrive at; to come to?

react - v. to act as a result of or in answer to?

read - v. to look at and understand the meaning of written words or numbers?

ready - ad. prepared; completed; organized; willing?

real - ad. true; truly existing; not false?

realistic - ad. in agreement with the way things are?

reason - n. the cause for a belief or act; purpose; something that explains?

reasonable - ad. ready to listen to reasons or ideas; not extreme; ready or willing to
compromise?

rebel - v. to act against a government or power， often with force; to refuse to obey;
n. one who opposes or fights against the government of his or her country?

receive - v. to get or accept something given， offered or sent?

recent - ad. a short time ago?

recession - n. a temporary reduction in economic activity， when industries produce
less and many workers lose their jobs?

recognize - v. to know or remember something or someone that was known， known
about or seen before; to accept another nation as independent and establish
diplomatic ties with its government?

record - v. to write something in order to have it for future use; to put sound or
pictures in a form that can be kept and heard or seen again; n. a writing that shows
proof or facts about something?

recover - v. to get again something that was lost， stolen or taken away ("The police
recovered the stolen money."); to return to normal health or normal conditions
("She is expected to recover from the operation.")?

red - ad. having the color like that of blood?

reduce - v. to make less or smaller in number， size or amount; to cut?

reform - v. to make better by changing; to improve; n. a change to a better
condition?

refugee - n. a person who has been forced to flee because of unjust treatment，
danger or war?

refuse - v. to reject; to not accept， give or do something?

regret - n. a feeling of sadness or sorrow about something that is done or that
happens?

reject - v. to refuse to accept， use or believe?

relations - n. understandings or ties between nations; members of the same family;
people connected by marriage or family ties?

release - v. to free; to permit to go; to permit to be known or made public?

religion - n. a belief in， or the honoring of， a god or gods?

remain - v. to stay in a place after others leave; to stay the same?

remains - n. a dead body?

remember - v. to think about the past; opposite forget?

remove - v. to take away or take off; to put an end to; to take out of a position or
office?

repair - n. work done to fix something?

repeat - v. to say or do again?

report - v. to tell about; to give the results of a study or investigation; n. the story
about an event; the results of a study or investigation; a statement in which the
facts may not be confirmed?

represent - v. to act in the place of someone else; to substitute for; to serve as an
example?

repress - v. to control or to restrict freedoms by force?

request - v. to ask for; n. the act of asking for?

require - v. to need or demand as necessary?

rescue - v. to free from danger or evil?

research - n. a careful study to discover correct information?

resign - v. to leave a position， job or office?

resist - v. to oppose; to fight to prevent?

resolution - n. an official statement of agreement by a group of people， usually
reached by voting?

resource - n. anything of value that can be used or sold?

responsible - ad. having a duty or job to do ("He is responsible for preparing the
report."); being the cause of ("They were responsible for the accident.")?

rest - v. to sit， lie down or sleep to regain strength; n. that which remains; the
others?

restrain - v. to keep controlled; to limit action by a person or group?

restrict - v. to limit; to prevent from increasing or becoming larger?

result - v. to happen from a cause; n. that which follows or is produced by a cause;
effect?

retire - v. to leave a job or position because one is old or in poor health?

return - v. to go or come back; to bring， give， take or send back?

revolt - v. to protest violently; to fight for a change， especially of government?

rice - n. a food grain?

rich - ad. having much money or goods; having plenty of something?

ride - v. to sit on or in and be carried along; to travel by animal， wheeled vehicle，
airplane or boat?

right - n. what a person legally and morally should be able to do or have ("It is their
right to vote."); ad. agreeing with the facts; good; correct; opposite wrong; on the
side that is toward the east when one is facing north; opposite left?

riot - v. to act with many others in a violent way in a public place; n. a violent action
by a large group of people?

rise - v. to go up; to go higher; to increase; to go from a position of sitting or lying
to a position of standing?

risk - n. the chance of loss， damage or injury?

river - n. a large amount of water that flows across land into another river， a lake or
an ocean?

road - n. a long piece of hard ground built between two places so people can walk，
drive or ride easily from one place to the other?

rob - v. to take money or property secretly or by force; to steal?

rock - n. a hard piece of mineral matter?

rocket - n. a device shaped like a tube that moves through air or space by burning
gases and letting them escape from the back or bottom， sometimes used as a
weapon?

roll - v. to turn over and over; to move like a ball?

room - n. a separate area within a building with its own walls?

root - n. the part of a plant that is under the ground and takes nutrients from the
soil?

rope - n. a long， thick piece of material made from thinner pieces of material， used
for tying?

rough - ad. not flat or smooth; having an uneven surface; violent; not made well?

round - ad. having the shape of a ball or circle?

rub - v. to move something over the surface of another thing?

rubber - n. a substance made from the liquid of trees with the same name， or a
similar substance made from chemicals?

ruin - v. to damage severely; to destroy?

rule - v. to govern or control; to decide; n. a statement or an order that says how
something must be done?

run - v. to move quickly by steps faster than those used for walking