1. barrier /'baerie/ n.障碍;棚栏
2. battery /'baeton/ n.电池(组)
3. beforehand /brfs:haend/ adv.预先,事先
4. biochemistry /bars(u)'kemistr/ n.生物化学
5 bother /'bp6s/ v.打搅,麻烦
6. boundary /'baundery/ n.分界线,边界;范围
7. breed /bri:d/ n.种,品种 v.繁殖,产仔
8. bureau /'bjusrsu/ n.局,办事处
9. calculate /'kaelkjslert/ vt.计算,核算;估计;推测
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