The noun 士兵 (shìbīng) means "soldier" or "enlisted personnel." It refers to a member of the military, typically of lower rank. It is a formal term commonly found in news reports and military contexts.
一名年轻的士兵勇敢地救出了被困的孩子。
Yī míng niánqīng de shìbīng yǒnggǎn de jiùchūle bèi kùn de háizi.
A young soldier bravely rescued the trapped child.
这些士兵已经在边境驻守了三个月。
Zhèxiē shìbīng yǐjīng zài biānjìng zhùshǒule sān gè yuè.
These soldiers have been stationed at the border for three months.
士兵们每天早上五点就开始训练。
Shìbīngmen měitiān zǎoshang wǔ diǎn jiù kāishǐ xùnliàn.
The soldiers start training at five o'clock every morning.