总有一个断电器以防止仪器超负荷运转。
There is always an internal circuit breaker to protect the instrument from overload.
这场流行病已使各医院以最大负荷运转。
Hospitals were already fully extended because of the epidemic.
但只能是在它们接近满负荷运转的情况下，否则整体效率就会很低。
But only if they operate at near capacity, otherwise, their overall efficiency is poor.
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