美国也是唯一一个不保障员工带薪假期的发达经济体，也是世界上仅有的两个不提供带薪产假保证的国家之一。

The U.S. is also the only advanced economy that does not guarantee workers paid vacation time, and it's one of only two countries in the world that does not offer guaranteed paid maternity leave.

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但这种情况是没有保证的。

But this is not guaranteed.

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最后，要在提供有退款保证的商店购买。

Finally, shop at a store that offers a money-back guarantee.

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So in some sense, the first law would suggest you can sort of break even.

初看起来，热力学第一定律,可以保证这个过程是可行的。

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Well, not everybody, but everybody can use to keep emails safe, just like sort of a really easy thing to do.

嗯，不一定是所有人，但是每个人都可以轻而易举地用这种密码来保证自己邮箱的安全，

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The goldsmith might also write notes promising so much gold and not promising the return of any particular item of gold.

这个金匠会写下票据,保证归还一定数量的金子,但是不保证归还某个特定的金器

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