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.