相反，对于我们称之为注意力的东西，来源是有限的，但是我们有一百万种方法来划分，管理和保存我们的注意力。

Instead, there is a limited supply of this thing called attention, and a million ways to divide, manage, and preserve it.

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借款限额的提高得以实现，同时保存了国际复兴开发银行在债券市场上的AAA等级，世行利用这一优势低价借款，并以有竞争力的利率放贷。

The borrowing limit increase was achieved while preserving IBRD's AAA rating in the bond markets, which it exploits to borrow cheaply and lend at competitive interest rates.

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雌性成蜂易于低温保存，对寄主有较强的搜索力和攻击力。

The female wasps could be stored under low temperature safely without influence on their host-searching and host-attacking abilities.

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