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61. on the average(=on average，on an average)平均 62.(be)aware of(=be conscious of，having knowledge or consciousness)意识到，知道 63. at the back of(=behind)在 后面 64. in the back of在 后部(里面);on the back of在 后部(外面);be on ones back(=be ill in bed)卧病不起 65. at ones back(=supporting or favoring sb.)支持，维护;have sb. at ones back有 支持，有 作后台 66. turn ones back on sb.(=turn away from sb. in an impolite way)不理睬(某人)，背弃，抛弃 67. behind ones back背着某人(说坏话) 68. be based on / upon基于 69. on the basis of根据 ，在 基础上 70. beat at在 运动项目上打赢 71. begin with以 开始to begin with(=first of all)首先，第一(经常用于开始语) 72. on behalf of(=as the representative of)以 名义 73. believe in(=have faith or trust in;consider sth./sb. to be true)相信，依赖，信仰 74. benefit(from) 受益，得到好处 75. for the benefit of 为了...的利益(好处) | 
