1. back adv.回（原处）;向后 adj.后面的 n. 背后，后部；背。
back and forth 来回，往返； back to back 背靠背。
behind one’s back 背后； look back 回顾。
put back 放回去turn one’s back on 避开，不理睬。
2. ◎backward advbackward and forward 来来回回。
bend /lean over backward to do 竭尽全力去做…
3. baggage n.行李 a piece of/an article of baggage
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
余额 (常用单数） check your bank balance
欠款（常用单数）the balance of 500 yuan must be paid within 90 days.
短语 be/ hang in the balance 不明朗的，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 balance on one leg
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 adj. be on a balanced diet
5. ●ban n.禁令 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 a bar of chocolate / soap 障碍 being a woman was a bar to promotion.
2) vt. 封堵 all the doors and windows were barred.
阻止 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。
those shoes are a real bargain at such a low 讨价还价 bargain with sb about /over sth
8. base n. 根据地，基地 v.以。为基地， 把基地设在。
1) base sth on/upon sth 以…为基础his book is based on a true story.
2) be based in以。为基地，把基地设在the toy company is based in guangzhou.
basic adj 基本的basic knowledge/skills basically adv.
9. ◎basis (复数 bases )
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 ofsome videos were banned on the basis of violence.
10. bath n.洗澡；浴室；澡盆； h**e/take a bath
bathe v. 洗澡，游泳 be bathed in …沉浸在，沐浴着（光线） bathroom n.浴室。
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/responsibility
3）忍受；容忍 （常用于疑问句、否定句，与can, could 连用） bear to do/doing
4) bear…in mind 记住。
12. beat v (beat ,beaten) 连续有节奏的敲击 my heart is beating faster than usual.
w**es are beating the shore. 击败： he beat me in the game. ※beat & hit &strike & knock
13. before it will be +段时间+before+ do/does…要过多久才…
it was +段时间+before+ did…没过多久就…
14. beg 乞求，请求 beg—begged—begged—begging beg sb. to do 请求、乞求某人做某事。
i beg your pardon. 对不起、请原谅（降调） 请再讲一遍（降调）
15. begin—began—begun—beginning begin with=start with 以…开始
to begin with=to start with (插入语)首先、第一。
i don’t like living here. to begin with, the room is far too small.
16. beginning n.开始，开端 at the beginning of… in the beginning= at first
17. ◎beh**e v. 表现 he beh**ed as if nothing had happened.
beh**e badly/well/like a true gentleman
beh**e oneself 表现得体，有礼貌 well / badly beh**ed children
18. ◎beh**ior n. 不可数 good/ bad beh**ior
be on your best beh**ior 尽量表现得体。
19. behind drop/ fall behind 落后 le**e sb./sth. behind 遗落、忘带。
20. ◎belief n. （不可数） 1）相信，信心 belief in i admire his belief in what he is doing.
2) 看法，信念 （不可数） he acted in the belief that he was doing good.
there is a general belief that things will soon get better.
3) 信仰 （可数 beliefs） religious/ political beliefs
短语 beyond belief 难以置信 to the best of one’s belief 尽其所知
21. believe believe it or not (插入语)信不信由你。
it is believed that he is a good teacher. =he is believed to be a good teacher.
22. belong belong to 属于（无被动） the house belonging to her is under repair.
23. bend v. 弯曲、弯腰、伏案 bend—bent—bent
she was bent over her desk writing a letter. 她正伏案写信。
24. ◎benefit 1) n. 优势，益处（不可数）she didn’t get much benefit from her staying abroad.
短语： be of benefit to...be beneficial to ..to one’s benefit 对某人有利。
for one’s benefit = for the benefit of sb. 为了帮助。为了某人的利益。
2） vt./ vi. benefit sb./ sth benefit from/ by...
beneficial adj. 有益的，有用的 be beneficial to ..
25. best do/ try one’s best to do 尽全力做 make the best of…尽量利用。
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