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  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) 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)