We can only guess at the number of deaths it has caused.我们只能估算它造成的死亡数。

Researchers can only guess at how this weird creature evolved.研究者们只能猜测这个奇怪的生物是如何进化的。

I have to guess at what he's feeling, he never tells me.我不得不猜测他的感受, 他从不告诉我。

You can only guess at what mental suffering they endure.你只能猜测他们忍受着什么样的精神折磨。