61. (be) aware of (=be conscious of , having knowledge or consciousness)意识到,知道。
62. at the back of (=behind)在...后面
63. in the back of在...后部(里面); on the back of在...后部(外面); be on one’s back(=be ill in bed)卧病不起。
64. at one’s back(=supporting or favoring sb.)支持,维护; have sb. at one’sback有...支持, 有...作后台
65. turn one’s back on sb. (=turn away from sb. in an impolite way)不理睬(某人),背弃,抛弃
66.behind one’sback背着某人(说坏话)67. be based on / upon基于
68. on the basis of根据...,在...基础上
69. beat...at在...运动项目上打赢
70. begin with以...开始. to begin with (=first of all)首先, 第一(经常用于开始语)
71. on behalf of (=as the representative of)以...名义
72. believe in(=have faith or trust in; consider sth./sb. to be true)相信,依赖,信仰。
73. benefit (from)受益,得到好处。
74. for the benefit of为了...的利益(好处)
75. for the better好转
76. get the better of (=defeat sb.)打败, 胜过。
77. by birth在出生上,论出身,按血统at birth在出生时; give birth to出生
78. blame sb. for sth.因...责备某人. blame sth. on sb.把...推在某人身上
79. in blossom开花(指树木)beinblossom开花(强调状态) come into blossom开花(强调动作)
80. on board到船上, 在船上, 上火车或飞机