Meaning of rěn bu zhù:
rěn bu zhù
忍不住
Adverb
cannot help; unable to bear
Kàn dào tā huájī de biǎoyǎn, wǒ rěn bu zhù xiào le qǐlái.
看到他滑稽的表演,我忍不住笑了起来。
Seeing his funny performance, I couldn't help but laugh.
Tā kàn dào zhè bù diànyǐng hòu, rěn bu zhù liú xià yǎnlèi.
他看到这部电影后,忍不住流下眼泪。
He couldn't help but shed tears after watching the movie.