It's difficult to really understand the theory of relativity.

真正理解相对论是不易的。

youdao

Now, even though it may be difficult to understand how a huge mass of ice can move—or flow, it's another word for it—it's really no secret that glaciers flow because of gravity.

如今，即使想要知道一大块冰如何移动——或换个词讲，漂浮——是非常困难的，但众所周知冰川漂浮是由于重力。

youdao

In this case, it’s not. It’s also very difficult to do when there’s a lot of physics jargon – a factor is that we really don’t understand.

现在这种情况就没必要，而且当台词中有很多物理术语的时候那也非常困难，本来我们就不懂嘛。

youdao