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(The amount of) movement of a working part of a mechanism that occurs before a point of action is reached; frequently attributive.
1960s; earliest use found in Wireless World.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。