To guarantee that the header is processed only once in a given source file, we start by testing the #ifndef.

为了保证头文件在给定的源文件中只处理过一次，我们首先检测 #ifndef。

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The passphrase will never be sent to the web when we upload our notes to Evernote online storage. This will guarantee that the encrypted text can only be decrypted on our computer.

当我们在线存储笔记时，加密密码并没有发送到网络上，从而排除他人通过网络来破解我们的笔记的危险。

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Only in this way can we guarantee the quality of service features and forums.

只有这样，我们才能保证服务的质量和论坛的特色。

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By dwelling upon the irretrievable, we not only guarantee many sleepless nights, we also drain precious energy and focus away from the things we can remedy.

FORBES: An Ancient Rule For Coping With Stress

If we develop these resources to the fullest, we will not only guarantee ourselves an affordable and reliable supply of energy, but also enjoy benefits throughout our economy.

FORBES: Mitt Romney's Bold Vision For America's Energy Independence

We got it right and we are the only party that can take people from recession to recovery and guarantee that we have growth in the future, and I'm very confident about the basis of growth in this country.

BBC: Take your politics too seriously