When they do forage for food and for shelter materials, they have to leave their homes and go up on land where their main predators are.

当它们寻找食物和遮蔽物的时候，它们不得不离开家，到主要捕食者所在的陆地上去。

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If, by contrast, everything was in a pile on the main floor, it would significantly reduce the usefulness of the library by making the search for materials virtually impossible.

如果采用相反的方式，将所有的东西都堆在一个大房间里，由于几乎不能进行资料搜索，因此会大幅度降低图书馆的有用性。

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As well as lithium-iron phosphate, other innovative materials have been used for the three main battery components of anode, cathode and electrolyte.

与锂-铁磷酸盐一样，其他新型材料已经用到了电池的三个主要部件，阳极、阴极和电解液。

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