66.turn one’s back on sb. (=turn away from sb. in an impolite way)
不理睬(某人),背弃,抛弃
67.behind one’s 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)
76.for the better
好转
77.get the better of (=defeat sb.)
打败, 胜过.