But building the infrastructure is a challenge.

但基础设施建设仍然是摆在眼前的难题。

Saying 'No' is a challenge for you.

第二点，挑战说" 不" 。

Our modern, noisier world is a challenge.

我们吵杂的现代世界是个挑战。

Storing all that ash is a challenge.

然而储存这些煤灰可真是令人头痛。

She said working separately was " a challenge."

她说，单独工作是“一项挑战”。

The weather could also be a challenge.

天气问题也可能是面临的挑战。

Innovation today might be a challenge tomorrow.

今天的创新可能是明天的挑战。

They were a challenge, but she was prepared!

考试虽然颇具挑战性，但她做了充分的准备！

Catching the tip will be a challenge too.

怎样与系绳的尖端对接也是个挑战。

Now this is going to be a challenge.

现在这将是个挑战。

And that's a challenging number to visualize.

这个数字很难想象。

It's a challenge to live, that's true.

在这里生活确实是个挑战。

That's a challenge for this generation of scientists.

这对这个时代的科学家来说是一个挑战。

No matter where he saw me, it was a challenge.

无论我在哪，他看到我就要发出挑战。

It has been a... challenging mating season for Birdperson.

鸟人的交配季真是 不容易啊。

It is starting to be a challenge, he said.

这开始成为一种挑战了，他这样说道。

And outside the Kurds, that's been a challenge.

外部还有库尔德武装，这确实是个不小的挑战。

So as I mentioned before, it's a challenge.

所以正如我之前提到的，这部剧很有挑战。

I will tell you what's been a challenge.

我来告诉你什么叫挑战。

Now, all jokes aside, cancer was a challenge for me.

不管这些笑话，癌症 对我来说确实是一项大挑战。