61 on the average 平均
62. aware of 意识到,知道
63.at the back of 在后面
64.in the back of 在后部;on the back of 在后部;be on ones back 卧病不起
65. at ones back 支持,维护;have sb. at ones back 有支持,有作后台
66.turn ones back on sb. 不理睬,背弃,抛弃
67.behind ones back 背着某人
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 首先,第一
72.on behalf of 以名义
73.believe in 相信,依赖,信仰
74.benefit 受益,得到好处。
75.for the benefit of 为了的利益
76.for the better 好转
77.get the better of 打败,胜过
78.by birth 在出生上,论出身,按血统 at birth 在出生时;give birth to 出生
79.blame sb. for sth. 因责备某人
blame sth. on sb. 把推在某人身上
80.in blossom 开花be in blossom 开花come into blossom 开花
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