不开心的表达：

1. what's eating you today?什么事让你今天这么烦啊？

2. she is looking down in the mouth today. Is there anything bothering her?

棘手问题的表达：

1. But no one's willing to talk about the elephant in the room.没有人愿意谈论这个棘手的问题。

如果谈论什么棘手的问题，可以使用短语talk about the elephant in the room about sth.

2. So it's like a hot potato.

短语积累：

1. terrible sales糟糕的销售

2.go bankrupt破产

3.on occasion偶尔

4.in the red 赤字