出其不意

The police surprised the thief into confessing.

警察出其不意地使小偷招认了。

I was surprised by the abrupt change of subject.

出其不意的变换题目吃惊。

Look, you whiney crybaby, we're not wasting the element of surprise to mollify your nyctophobia.

听着，你这个瞎抱怨的爱哭鬼，们可不会为了迁就你的黑夜恐惧症浪出其不意这一要素。

This is a very quick and surprisingly effective way to limit your opponent's economy and is especially effective against the turtler because they honestly won't be expecting it.

这是个限制敌人经济的非常迅速又出其不意的有效方，对抗龟派时尤其有效，因为它们通常不会想到的。