科学家们正试图理解宇宙是如何形成的。

Scientists are trying to ___understand how the universe began.

我不明白为什么我的手机电池耗电这么快。

I don't ___understand why my phone battery drains so quickly.

课后，学生们终于明白了如何解这些数学题。

After the lesson, the students finally ___understand how to solve these maths problems.