老兵

shāng cán lǎo bīng

伤残老兵

disabled veteran

shén me yīn sù cù shǐ zhè ge yì gōng lǎo bīng bù tíng de fú wù tā rén ne

什么因素促使这个义工老兵不停地服务他人呢？

What drives the veteran volunteer to ceaselessly serve others?

tuì wǔ lǎo bīng

退伍老兵

former soldier

huán bǎo lǎo bīng

环保老兵。

person with experience in environmental protection