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
81. on board到船上,在船上,上火车或飞机
82. boast of吹嘘
83. out of breath喘不过气来
84. in brief简言之
85. in bulk成批地,不散装的
86. take the floor起立发言
87. on business出差办事
88. be busy with sth.于某事be busy doing sth.忙于做某事
89. last but one倒数第二
90. but for要不是表示假设
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