Phono-semantic — one part hints at the meaning, another at the sound
Example phrases
对偏远地区来说,这条公路几乎是连接外界的生命线。Duì piānyuǎn dìqū lái shuō, zhè tiáo gōnglù jīhū shì liánjiē wàijiè de shēngmìngxiàn.For remote areas, this road is almost a lifeline connecting them to the outside world.
这条河是沿岸村民灌溉农田的生命线。Zhè tiáo hé shì yán'àn cūnmín guàngài nóngtián de shēngmìngxiàn.This river is the lifeline that irrigates the fields of the villagers along its banks.
铁路修通后,成了山里孩子上学的生命线。Tiělù xiūtōng hòu, chéngle shānlǐ háizi shàngxué de shēngmìngxiàn.After the railway was built, it became the lifeline for children in the mountains going to school.