If no key is present in the cue array, no sound is played.

如果提示（cue）数组中不存在任何键，就不会播放任何声音。

There is no key to happiness, the door is always open.

这世界上没有通往幸福之门的钥匙，因为那个门总是打开的。

This time there was no key and the door was slightly open.

这次没有钥匙了，门是微开的。

Penny:Okay, I got a box, but there's no key in here. Just letters.

我是找到盒子了，但没有钥匙，都是信。

There was no key, but it was of considerable weight, so we transferred it carefully to our own little cabin.

箱上没有钥匙，非常沉重，我们小心地把它搬到我们的舱里。

With no key to interpret these symbols, though, we can't know whether ancient humans were giving false directions to rival tribes or simply bragging about their hunting prowess.

尽管如此，没有破译这些符号的钥匙，我们就不知道远古的人类是否向敌对部落给出了错误指导，或者只是夸大了自己的狩猎本领。