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The range of engine speeds (in terms of r.p.m.) over which the engine of a motor vehicle delivers greatest power.
1960s; earliest use found in Manitowoc (Ohio) Herald Times.
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。