These fluctuations in the heap size can slow down the application and are unnecessary if the physical memory is not needed for anything else running on the same system.
堆大小的这些上下浮动可能会降低应用程序的速度，但如果同一系统上运行的其他程序不需要物理内存，则没有必要这样。
The researchers suggest splitting water into hydrogen and oxygen during the day whenever electricity from solar cells is not needed for anything else.
研究人员建议当白天太阳能电池中产生的电流不做它用的时候来把水分解成氢气和氧气。
And, perhaps more than anything else, that gift is what is needed today in our families, in our churches, and in our world in general.
礼物对于今日的家庭、教堂和整个世界来说比起其它任何东西都更为必要。
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