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. beatat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)
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