Phono-semantic — one part hints at the meaning, another at the sound
Example phrases
处理化学试剂时必须格外留神,任何细小疏忽都可能导致事故。Chǔlǐ huàxué shìjì shí bìxū géwài liúshén, rènhé xìxiǎo shūhu dōu kěnéng dǎozhì shìgù.When handling chemical reagents, one must be especially careful; any tiny oversight may lead to an accident.
地上很滑,留神别摔倒了。Dì shàng hěn huá, liúshén bié shuāidǎo le.The floor is slippery, so watch out that you don't fall.
开车时要留神路边突然跑出来的孩子。Kāi chē shí yào liúshén lùbiān tūrán pǎo chū lái de háizi.When driving, watch out for children who suddenly run out from the roadside.