1. on the average(=on average，on an average)平均
2.(be)aware of(=be conscious of，having knowledge or consciousness)意識到，知道
3. at the back of(=behind)在後面
4. in the back of在後部(裏面);on the back of在後部(外面);be on ones back(=be ill in bed)卧病不起
5. at ones back(=supporting or favoring sb.)支持，維護;have sb. at ones back有支持，有作後台
6. turn ones back on sb.(=turn away from sb. in an impolite way)不理睬(某人)，背棄，拋棄
7. behind ones back揹着某人(説壞話)
8. be based on / upon基於
9. on the basis of根據，在基礎上
11. begin with以開始to begin with(=first of all)首先，第一(經常用於開始語)
12. on behalf of(=as the representative of)以名義
13. believe in(=have faith or trust in;consider sth./sb. to be true)相信，依賴，信仰
14. benefit(from)受益，得到好處
15. for the benefit of為了的利益(好處)
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