回答

・It's a big trouble.
・It's a tough problem.

「這完全令人困惑」用英語可以表達為 It's a big trouble. 或 It's a tough problem. 。

I didn’t think it would be this difficult. It's a big trouble.
（我沒想到會這麼難。這完全令人困惑。）

I've pointed it out many times, but he doesn't change his ways. It's a tough problem.
（即使我多次向他指出這一點，他也不會改變他的做法。這完全令人困惑。）

有幫助｜0