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。

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.

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然而，他警告说，尽管在实地执行微生物实验具有巨大的价值，但实际上非常困难。

However, he warns that, although microbiological tests carried out in the field are hugely valuable, they are logistically very difficult.

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日本依赖核能的一个重要原因在于它缺乏固有的能源资源，伴随而来产生了必须要在地震带上建造安全的反应堆，但这是非常困难的。

ONE reason for Japan’s reliance on nuclear power—with all its attendant difficulties of building reactors safely in an earthquake zone—is its lack of indigenous energy sources.

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But it's just too complicated and too -it's impossible to make it work perfectly.

但这非常困难,非常复杂,而且不可能尽善尽美

耶鲁公开课 - 金融市场课程节选

And this is no surprise if what we are is the workings of our physical brains, but it is extremely difficult to explain if one is a dualist.

如果我们的本质就是生理大脑的活动,那这也就没什么可惊奇的,但对于二元论者来说,解释这些却是非常困难的

耶鲁公开课 - 心理学导论课程节选

I would just say that in my experience you really have to want to do this, I would definitely encourage people to be aware of the breath and try to be mindful, but remember too it's very difficult for us to leave the negative feelings.

我只想说,根据个人经验，确实要真心想这么做，我肯定会鼓励大家,留意自己的气息，并尝试着留心察觉，但让我们抛下负面情绪,也非常困难。

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