英语词汇proper operation是什么意思，proper operation的用法、释义、翻译、读音、例句、短语词组-英汉汉英翻译词典

单词	proper operation
释义	DEFINITIVE EXAMPLES 权威例句〔upkeep〕Maintenance in proper operation, condition, and repair.保养：为保证正常的运行，状况，和修缮状况所做的保养美国传统
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