Slangs
The first one “To have butterflies in one&`&s stomach”.
The expression &`&butterflies in one’s stomach&`& describes the feeling you get in your stomach when you are nervous. That fluttering feeling that can make your stomach feel a bit unsettled is a result of such nervousness.
For example:
I had butterflies in my stomach when I was sitting there waiting for my turn, but once I stepped onto the stage, I was just fine.
坐在那里等的时候我心里七上八下的,很紧张,不过一上台我就没事了。
Another slang which shares the same meaning as “butterfly in one’s stomach” is Ants in one’s pants
For example:
The man over there has been waiting for a long time and he&`&s really getting ants in his pants。
那边的那个人等得太久了现在他开始变的不耐烦了。
The second one “a social butterfly”.
A social butterfly can fit into any room, be comfortable, make friends, and fly away to the next gathering and repeat the process all over again.
For example:
You&`&re truly a social butterfly and love to scatter your energy everywhere.
你的确是个社交花蝴蝶,喜欢到处挥洒自己的活力.