back - n. the part behind the front; ad. the other way from forward

bad - ad. wrong; acting against the law; not good

balance - v. to make two sides or forces equal

ball - n. something round

balloon - n. a device of strong, light material that rises when filled with gas lighter than air

ballot（选票） - n. a piece of paper used for voting

ban - v. to not permit; to stop; n. an official restriction

bank - n. an organization that keeps and lends money

bar（禁止） - v. to prevent or block

barrier - n. anything that blocks or makes an action difficult

base - n. a military center; v. to establish as a fact ("Her research was based on experiments.")

battle - n. a fight between opposing armed forces

be - v. to live; to happen; to exist

beat - v. to hit again and again

beauty - ad. that which pleases the eye, ear or spirit

because - prep. for the reason that ("He left because he was sick.")

become - v. to come to be

bed - n. a sleeping place

before - prep. earlier

begin - v. to do the first part of an action; to start

behind - ad. at the back of; in back of

believe - v. to think; to feel sure of; to accept as true; to trust

bell - n. an instrument that makes a musical sound ("a church bell")

belong - v. to be owned by; to be a member of

below - ad. lower than

best - ad. the most good

betray（背叛） - v. to turn against; to be false to

better - ad. more good than

between - ad. in the space or time that separates; from one to the other ("talks between two nations")

big - ad. of great size; not small

bill（法案） - n. a legislative proposal

biology - n. the scientific study of life or living things in all their forms

bird - n. a creature that flies

bite - v. to cut with the teeth

black - ad. dark; having the color like that of the night sky
blame - v. to accuse; to hold responsible

blanket - n. a cloth cover used to keep warm

bleed - v. to lose blood

blind - ad. not able to see

block （阻碍）- v. to stop something from being done; to prevent movement

blood - n. red fluid in the body

blow - v. to move with force, as in air ("The wind blows.")

blue - ad. having the color like that of a clear sky

boat - n. something built to travel on water that carries people or goods

body - n. all of a person or animal; the remains of a person or animal

boil - v. to heat a liquid until it becomes very hot

bomb - n. a device that explodes with great force; v. to attack or destroy with bombs

bone - n. the hard material in the body

book - n. a long written work for reading

border - n. a dividing line between nations

born - v. to come to life; to come into existence

borrow - v. to take as a loan

both - ad. not just one of two, but the two together

bottle - n. a container, usually made of glass, to hold liquid

bottom - ad. the lowest part of something

box - n. something to put things into; a container, usually made of paper or wood

boy - n. a young male person

boycott（地质、断交） - v. to refuse to take part in or deal with

brain - n. the control center of thought, emotions and body activity of all creatures

brave - ad. having no fear

bread - n. a food made from grain

break - v. to divide into parts by force; to destroy

breathe - v. to take air into the body and let it out again

bridge - n. a structure built over a waterway, valley or road so people and vehicles can cross from one side to the other

brief - ad. short; not long

bright - ad. giving much light; strong and clear in color

bring - v. to come with something

broadcast - v. to send information, stories or music by radio or television; n.a radio or television program

brother - n. a male with the same father or mother as another person

brown - ad. having the color like that of coffee

budget（预算） - n. a spending plan

build - v. to join materials together to make something

building - n. anything built for use as a house, factory, office, school, store or place of entertainment

bullet - n. a small piece of metal shot from a gun

burn - v. to be on fire; to destroy or damage by fire

burst - v. to break open suddenly

bury - v. to put into the ground and cover with earth

bus - n. a public vehicle to carry people

business - n. one's work; buying and selling to earn money; trade

busy - ad. doing something; very active

but - conj. however; other than; yet

buy - v. to get by paying something, usually money by - conj. near; at; next to ("by the road"); from ("a play by William Shakespeare"); not later than ("by midnight")