Here's a harder case to think about.

但想想更复杂的情况。

China is a complex market, so huge and it's also a hard case.

中国市场巨大而且复杂，在其中发展也是艰难的。

You see a single roll of grain that's covered in a hard case.

你看到一行覆盖着硬壳的玉米粒。

What makes Naoko such a hard case for you?

是什么让直子对你来说如此困难？

So, um... Mom tells me you're working on a hard case.

那么 嗯...妈妈告诉我你在 处理一个很难的案子。