有时需要密切地跟踪实际工时。

Sometimes you need to follow actual work closely.

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这将会占用大量的机床实际加工时间，降低机床的效率。

Therefore much time of real machining is consumed, the efficiency of machine tool is reduced.

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通常，它们的实际加工时间少于其加工时间的30%。

Often the actual chip-production time is less than 30% of the total cycle time.

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通常，它们的实际加工时间少于其加工时间的30%。

Often the actual chip-production time is less than 30% of the total cycle time.

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