81. boast of (or about) 吹嘘
82. out of breath 喘不过气来
83. in brief(=in as few words as possible)简言之
84. in bulk 成批地，不散装的
85. take the floor 起立发言
86. on business 出差办事。
be busy with sth = be busy doing sth 忙于做某事
忙于做某事和忙于某事英语，87. be busy with sth。于某事。 be busy doing sth. 忙于做某事
88. last but one 倒数第二。
89. but for (=without) 要不是. 表示假设
90. buy sth. for…money 用多少钱买
91. be capable of 能够， 有能力
be capable of being +过去分词：是能够被…的
93. in case (=for fear that) 万一;
忙于做某事的英文短语：be busy doing sth. busy： adj.忙碌的;无暇的;忙于(做某事);人来车往的;熙熙攘攘的； v.忙着做某事； 第三人称单数： busies现在分词： busying过去式： busied过去分词： busied比较级。
94. in case of (=in the event of)如果发生…万一
忙于某事。【翻译】：1、第一种：be busy doing sth .【举例】：I am busy cleaning my bedroom . (我正忙于打扫我的卧室)2、第二种：be busy with sth .【举例】：Jim is busy with his homework . (吉姆忙于。
in the case of 至于…，就…而言
95. in no case在任何情况下都不(放句首倒装句)
96. be cautious of 谨防
97. center one’s attention on(=focus one’s attention on) 把某人的注意力集中在…上
好的 be busy doing sth / be busy with sth 忙于做某事 例如 I am busy doing my homework now 就等于 I am busy with my homework now.我现在正忙着做作业 若有疑问及时追问，满意敬请采纳，O(∩_∩)O谢谢~~。
98. be certain of (=be sure of) 有把握， 一定。
99. for certain of (=for sure )肯定地，有把握地
100. by chance(=accidentally，by accident)偶然
忙于某事：be busy doing sth 英语中的 be busy doing sth 是一个常用搭配，比如：He is busy writing，他正忙于写作。I’m busy cooking the dinner，我正忙着烧饭。She was busy weeding the garden，她在花园里忙。
