| 单词 | proper operation |
| 例句 | 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 |
英语例句辞典收录了559068条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。
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