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。

youdao

Our only salvation lies in repentance, but this does not guarantee that we will be chosen to go to heaven and not to hell.

我们唯一的救赎是悔改，但是这也不能保证我们将来一定会被检选进入天堂，而不是地狱。

youdao

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。

youdao

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