英语词汇非强制性是什么意思，非强制性的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典-电脑手机教程网

单词	非强制性
释义	ENGLISH PHRASES 英文词组〔coverage〕optional/additional coverages 非强制性/附加险韦氏高阶〔optional〕an optional activity 非强制性活动英汉大词典
随便看	screw up screw up screw up screw up screw up courage screw up one's courage screw up one's courage screw valve screw vault screw vent screw ventilation screw vice screw washer screw wedge screw wheel screw wiper screw working mechanism screw wrench screw-cap screw-cutting machine screw-discharge sedimentation centrifuge screw-driven planer screw-driven shaper screw-driven slotter screw-driver

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