当人们因为某件事情感到既兴奋又紧张的时候就可以说 butterflies in their stomach.

例句

My interview starts in ten minutes. I've got butterflies in my stomach!

Julie has butterflies in her stomach every time Mike speaks to her.

I always get the butterflies before big speeches.

请注意

如果一个人特别外向喜欢社交那么就可以称这个认为 social butterfly.

Alan goes out every night and loves meeting new people. He's such a social butterfly.