Thus, constant cleaning and oiling must be done to maintain its efficiency.
因此，不断的清洁和上油必须做的，以维持其工作效率。
Like most filters, regular cleaning must be done to maintain its efficiency.
像大多数过滤器、定期清理必须做的，以维持其工作效率。
Like most filters, regular cleaning must be done to maintain its efficiency.
像大多数过滤器、定期清理必须做的，以维持其工作效率。
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