我不太明白这道数学题的意思。

I don't ___understand this math problem.

我完全理解你现在的压力和焦虑。

I fully ___understand the pressure and anxiety you're feeling right now.

这首诗可以从多个角度理解。

This poem can be ___understood in various ways.

我理解你明天不会来参加会议了？

I ___understand you won't be attending the meeting tomorrow?

她完全理解量子力学的复杂原理。

She thoroughly ___understands the complex principles of quantum mechanics.