B
　　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  adv.
　　backward 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
　　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.
　　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

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