她不由自主地笑了起来。
Tā bùyóuzìzhǔ de xiào le qǐlái.
English
She couldn't help laughing.
involuntarily; can't help but
(idiom) can't help but; involuntarily
Every character draws itself stroke by stroke, then hands you the brush to trace it yourself.
Nice writing!
她不由自主地笑了起来。
Tā bùyóuzìzhǔ de xiào le qǐlái.
She couldn't help laughing.
他不由自主地后退了一步。
Tā bùyóuzìzhǔ de hòutuì le yí bù.
He involuntarily stepped back.
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.