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

62. (be) aware of (=be conscious of , having knowledge or consciousness)意識到,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) 臥病不起.?

65. at one’s back(=supporting or favoring sb.) 支持,維護; have sb. at one ’s back 有…支持, 有…作后臺?

66. turn one’s back on sb. (=turn away from sb. in an impolite way) 不理睬(某人),背棄,拋棄?

67. behind one’s back 背著某人(說壞話)?

68. be based on? upon 基于?

69. on the basis of 根據(jù)…, 在…基礎上?

70. beat…at 在…運動項目上打贏?

71. begin with 以…開始. to begin with (=first of all) 首先, 第一(經(jīng)常用于開始語)?

72. on behalf of (=as the representative of) 以…名義?

73. believe in(=have faith or trust in; consider . to be true) 相信,依賴,信仰.?

74. benefit (from) 受益,得到好處.?

75. for the benefit of 為了…的利益(好處)?