她不由自主地笑了起来。
She couldn't help laughing.
不由自主
(idiom) can't help but; involuntarily
Watch it being written
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
不
由
自
主
Nice writing!
Build with these blocks
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
不
由
自
See it in sentences
他不由自主地后退了一步。
He involuntarily stepped back.