不要低估学习一门新语言所需的时间。

Don't ___underestimate the time it takes to learn a new language.

我认为你低估了自己解决这个问题的能力。

I think you ___underestimate your own ability to solve this problem.

这位候选人低估了公众对其对手的支持程度。

The candidate ___underestimated the level of public support for her opponent.