For large tree data sets you probably want to only load the necessary data for the visible nodes of the tree. When a user expands a node, it starts to load the children of that node.
对于较大的树型数据集，您可能只想加载可见树节点的必要数据，当用户展开一个节点后再记载该节点的子节点。
Compared with other renewable sources of energy, they are probably best able to match a utility's electrical load, says Nathaniel Bullard of new energy Finance, a research firm.
研究公司New Energy Finance的Nathaniel Bullard说，比起其他的新能源，他可能是和公共用电负荷最匹配的一种方式。
Sooner or later (probably sooner), you'll load the wrong version of a class from a place you aren't even thinking about and waste hours debugging.
您迟早(通常很快)会在您想都想不到的地方加载类的一个错误版本的类并会为此付出大量的调试时间。
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