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51. arise from 由引起. 52. arrange for sb./sth. to do sth. 安排做 53. arrive on 到达 arrive at 到达某地;得出,作出; arrive in 到达某地 54. be ashamed of =feel shame, guilt or sorrow because of sth. done 以为羞耻 55. assure sb. of sth. =try to cause to believe or trust in sth.) 向保证, 使确信. 56. attach 缚, 系 ,结 57. make an attempt at doing sth. 试图做 58. attend to 注意,照顾; attend on 侍候,照料 59. attitude to/ toward 对的态度.看法 60. attributeto 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 | 
