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Each of the cogs of the wheel on the driveshaft of a windmill or watermill.
Mid 17th century; earliest use found in John Evelyn (1620–1706), diarist and writer.
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。