新东方在线：考研英语核心词汇3
absence of mind心不在焉同义替换：
being absent-minded
absence 原始涵义：
n. 缺席，不在 I want to ask for leave of absence for several days. 我想请几天假。
缺乏，不存在 In the absence of anybody more experienced, I took command. 由于找不到其他更有经验的人，只好由我来指挥。
造句：
Frequently absence of mind in the class made him fail in the exam.
经常在课上心不在焉使他考试不及格。
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