Translation of "Challenge" in Chinese

That's a huge challenge.

这是一个巨大的挑战。

We accept your challenge.

我們接受你們的挑戰。

She said she enjoyed the challenge.

她说她喜欢那个挑战。

I don't get enough challenge in this job.

这份工作没什么挑战性。

The challenge we are going to face is how to increase work efficiency.

如何提高工作效率是我们现在要面临的难题。