To have a face like thunder:

臉像打雷一樣 ×

火冒三丈 √

例句：

He had a face like thunder when he came out of the manager's office this morning.

他今天早上從經(jīng)理辦公室出來的時候滿臉怒氣。

To chase the rainbows:

追逐彩虹 ×

癡人說夢 √

例句：

You have only started two months ago, you are already thinking about promotion. Well, I think you're just chasing rainbows.

你才來了兩個月就想著升職的事情了，我看啊，你是凈想好事兒呢。

Rainy day:

① 雨天

② 窮困時期 √

例句：

I'll put the rest in the bank for a rainy day.

我要把余款存入銀行以備不時之需。

（內(nèi)容來自學(xué)英語口語，如有侵權(quán)請聯(lián)系刪除）