1.表述：have butterflies in one’s stomach
释义：To have a feeling of nervousness, often before a performance or undertaking of some kind. （重要不安，恐怖，慌张）
例句：Sitting there at my sister's wedding dinner, I had butterflies in my stomach because I know I'd have to stand up and make a speech.
Yeah, sure, I had butterflies in my stomach in the locker room! But once I got out on the court and caught that first pass, I was just fine.
I almost didn't go on stage and perform tonight because I had butterflies in my stomach.
I always have butterflies in my stomach when I see the people from the personnel department.
2.表述：ants in the/one’s pants
释义：Said of one who is unable to sit still, due to anxiety, excess energy, or impatience. （如坐针毡）
用法：它是名词短语，作谓语和动词have连用，即：have ants in the/one’s pants。
例句：The kids really have ants in the pants today, so I'm going to take them to the playground.
A: Why is Carrie pacing?
B: She's waiting for her doctor to call, so she's had ants in her pants all day.
A: You have ants in your pants this afternoon. Is something wrong?
B: A little bird told that something bad was goona to happen to me.
明天我们进修了2个生活笼统的雅思语汇：ants in one's pants和have butterflies in one's stomach。Hope that you can bear them in your mind。