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

It may be difficult to do at first. Don't let this discourage you.

开始时做起来也许比较困难。不要让这个泄你的气。

《柯林斯英汉双解大词典》

Considering your responsibilities, it may be difficult to add another commitment to your schedule.

考虑到你的各项责任，在你的时间表上增加另一项委托可能有难度。

youdao

So it may be difficult to get that done in Washington in this context.

WHITEHOUSE: Press Briefing by Deputy Press Secretary Bill Burton

After making that assessment, it may be difficult for many to conclude that the company is undervalued.

FORBES: Should RIM Call it Quits?

So, I think this question will be fun to answer, but it may be difficult to answer.

FORBES: Ask the Readers: How Much Do You Spend on Fun?