文档介绍：B
1. back  (原处);向后 n. 背后,后部;背
back and forth 来回,往返 
back to back 背靠背
look back 回顾
put back 放回去    
turn one’s back on 避开,不理睬
2. backward       
backward and forward  来来回回
3. baggage     
a piece of/an article of baggage  一件行李
4. balance    
1) n. ①平衡 
keep a balance (between A and B)     
lose one’s balance
disturb the balance of one’s mind
②余额(常用单数) 
check your bank balance
③欠款(常用单数)
The balance of 500 yuan must be paid within 90 days.
be/hang in the balance 未定的, 悬而未决的
catch/throw sb. off balance 使...…失去平衡; 使…...不知所措    
on balance 总的来说
2)v. ①保持平衡  
~(sth)on sth      
He balanced the cup on her knee.
②同等重视 
balance A with/and B  
balance home life with career
③比较权衡 
balance A against B   
balance the cost against its benefit
balanced    
be on a balanced diet
5. ban    v. 禁止,取缔  
a ban on smoking 禁烟令 
place… under ban 对…...加以禁止     
ban sb. from sth./ doing 禁止某人做......
6.  bar 
1)  n. 条,块,障碍   
a bar of chocolate/soap        
Being a woman was a bar to promotion(晋升).
2) vt. 封堵,阻止      
All the doors and windows were barred.
bar sb. from...    
bar players from drinking
7. bargain  n.(经讨价还价之后)成交的商品;廉价货 v. 讨价还价
Those shoes are a real bargain at such a low price.  
bargain with sb about /over sth
8. base n. 根据地,基地   ......为基础, 把基地设在......
base sth on/upon sth  使......以...…为基础            
His book is based on a true story.
be based in 以...为基地,把基地设在          
The pany is based in Guangzhou.
basic  adj 基本的
basic knowledge/skills       
basically
9. basis  (复数 bases ) n.
1)基础,要素 
form the basis of…
2) 基准,原则 
on a regular /permanent basis 以定期的/永久的方式
3) 原因,缘由 
on the basis of…        
Some videos were banned on the basis of violence.
10. bath  ;浴室;澡盆
have/take a bath
bathe  ,游泳 
be bathed in …沉浸在,沐浴着(光线)     
bathroom 
11. bear(bore, born/borne) v.
1)承受(重量) 
The ice is too thin to bear your weight.
2) 负担, 承担 
bear the cost/ burden/responsibili