61. on the average（=on average，on an average）平均

62.（be）aware of（=be conscious of，having knowledge or consciousness）意识到，知道

63. at the back of（=behind）在…后面

64. 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

65. at one’s back（=supporting or favoring sb.）支持，维护；have sb. at one‘s back有…支持，有…作后台

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）
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76. for the better好转

77. get the better of（=defeat sb.）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（指树木）be in blossom开花（强调状态）come into blossom开花（强调动作）

81. on board到船上，在船上，上火车或飞机

82. boast of（or about）吹嘘

83. out of breath喘不过气来

84. in brief（=in as few words as possible）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（=without）要不是表示假设
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91. buy sth. for…money用多少钱买

92. be capable of能够，有能力be capable of being +过去分词：是能够被…的

93. in any case（=for love or money，at any rate，at any price，at any cost，whatever happens；anyhow）无论如何

94. in case（=for fear that）万一；

95. in case of（=in the event of）如果发生…万一in the case of至于…，就…而言

96. in no case在任何情况下都不（放句首倒装句）

97. be cautious of谨防

98. center one’s attention on（=focus one‘s attention on）把某人的注意力集中在…上

99. be certain of（=be sure of）有把握，一定

100. for certain of（=for sure）肯定地，有把握地

101. by chance（=accidentally，by accident）偶然

102. for a change换换环境（花样等）

103. charge sb. with…控告某人犯有…

104. in charge of（=responsible for）负责（某事）in the charge of…由…管

105. take charge of（=to be or become responsible for）负责管理（照顾）

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121. be concerned with（=about）与…有关

122. concern oneself about / with关心

123. in conclusion（=as the last thing）最后一点；at the conclusion of当…结束时；

124. condemn sb. to判决

125. on condition that（=if）以…为条件，假如in that = because因为；now that = since既然；for all that = although尽管

126. in / out of condition（=thoroughly healthy or fit / not fit）健康状况好/不好in good（bad）condition处于良好（坏）状态

127. confess（to）（=admit a fault，crime，or sth. wrong）承认，供认；confess to a crime承认罪行

128. confide in（=to talk freely to sb. about one’s secret）对…讲真心话，依赖

129. in confidence推心置腹地；with confidence满怀信心地；have confidence in对…有信心

130. confidence in sb. / sth.对…的信赖

131. be confident of有信心；confidential机密的

132. confine…to…把…限制在某范围内

133. confirm sb. in使某人更坚定（信念等）

134. conform to（=be in agreement with，comply with）符合，遵照，遵守；1）obey服从；2）observe；3）comply with照…办；4）keep to遵循；5）abide by服从；6）stick to按……做

135. be confronted with（=be brought face to face with）面对，面临