短语 a big deal 常被用来形容某人或某个情况、形势非常重要。

例句

It's obviously a big deal to her to get a promotion first because she can move up in the company faster than anybody else in the team.

I just couldn't understand why they quarrelled so much over the colour of a picture frame - it's not a big deal!

请注意

短语 a big no-no 用来形容绝对不能做或不应该做的事情。

Wearing jeans is a big no-no in a posh restaurant.

Arriving late and leaving early is a big no-no at our workplace.