sneak in

基本解释

Try to sneak in kisses, squeezes, touches, that hint at a lot more fun later that night.
试着偷偷的亲吻对方，抓她，抚摸他这会给你们晚上带来更多的快乐的。
Now, if we try to sneak in a new employee with an invalid network ID, our application knows not to accept it.
现在，如果我们试图偷偷在一个新员工中输入一个无效网络ID，应用应该会拒绝它。
For example, we'll see why looking for incorrect input is a mistake, and how attackers can often sneak in illegal negative numbers without using the "-" character.
例如，我们将看到为什么寻找不正确的输入是一个错误，而且攻击者如何能经常使用非法的负数（而不使用“-”字符）就可以潜入。

Let's sneak in one more derivative here, which is to take the derivative of the derivative.
我们再求一次导数,也就是对导数求导
耶鲁公开课 - 基础物理课程节选

Ok, so maybe you sneak in your own food and skimp on all the paraphernalia.
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