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)f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.

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

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

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