periodic cleaning
... 定期测试装置 routiner 定期清洗 periodic cleaning 定期清理 periodic cleaning ...
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... Delivery Indicator Lamp » 交付指标灯 wash regularly » 定期清洗 month-and-year » 个月和年 ...
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我们定期清洗和修理机器。
We clean and repair the machines as a matter of routine.
《牛津词典》
门把手是铜制的，需要定期清洗。
The door handles were made of brass and needed cleaning regularly.
youdao
定期清洗空调，不仅为了健康，还可以声部少电；
Periodically clean air-conditioning, not only for health, fairly not bad the part stops giving an electric shock.
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