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.
汤姆将要查看未满负荷运转的工厂。
Tom will visit factories which were operated below capacity.
换句话说，只要大脑能满负荷运转，就不需要更多的睡眠。
In other words, so long as the brain is functioning at full capacity, there's no great requirement for sleep.
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