If you want to make sure both conditions are true and they both have to be true for any code to be executed, use ampersand ampersand.

如果你想保证两个条件都成立,或者它们两个都必须为真值，才能执行一些代码，那就使用“&&“

哈佛公开课 - 计算机科学课程节选

You're trusting the programmer did it right, but this now tells you something.

现在，我们不能保证这是对的，对吧？你必须相信程序员写的是对的。

麻省理工公开课 - 计算机科学及编程导论课程节选

All right, so I did this not at all purposely, but this can point out for you that you need to make sure that the number of electrons that you have in your molecular orbital does match up with the total number that you have in your atomic orbitals.

我并不是故意这么做的，但这告诉我们必须要保证,分子轨道里的电子数,和原子轨道里的,总电子数能对上。

麻省理工公开课 - 化学原理课程节选

The armies of the state, as you will see in a while, are growing, and moreover, "You, oh big guy, you will assert our own privileges.

而国家的军队正在增长,稍后你们将会看到这一点,此外"您必须保证我们的特权

耶鲁公开课 - 欧洲文明课程节选

It says that you have to keep deposits with us here at the central bank; either that or else keep vault cash and show that you have it as reserves for your deposits.

它声明你必须在中央银行这里,付保证金；,要不那样做，要不就在金库中存钱,并且表明你把它作为,存款中的储备金。

耶鲁公开课 - 金融市场课程节选

But it's only an effective vaccine in the context where you have people who can go to the doctor's office, or to an urgent care, some kind of medical facility, three times, reliably, at a specified period of time.

但为了保证接种效果,人们必须亲自去诊疗室,或者在急诊室里,使用一些医学设施辅助接种,还需要接种三次,它只在一段时间内有效

耶鲁公开课 - 生物医学工程探索课程节选

Inflation is the most important thing according to many views because the Fed has to guarantee the soundness of the money supply -- and there have been so many cases in history when the central bank allowed debasement of the currency through inflation.

通货膨胀是最重要的事情,根据很多观点,因为美联储必须保证,货币供应的稳固,并且在历史上有太多的例子,当中央银行允许,通过通货膨胀改造货币。

耶鲁公开课 - 金融市场课程节选