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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 70. beatat在运动项目上打赢 71. begin with以开始to begin with首先，第一 72. on behalf of以名义 73. believe in相信，依赖，信仰 74. benefit受益，得到好处 75. for the benefit of为了的利益 76. for the better好转 77. get the better of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be in blossom开花come into blossom开花 81. on board到船上，在船上，上火车或飞机 82. boast of吹嘘 83. out of breath喘不过气来 | 
