Meaning of yì wù:
yì wù
义务
Noun
duty; obligation (CL:項|项[xiang4]); volunteer (work etc)
Tā bǎ bāngzhù tārén shìwéi zìjǐ de zérèn hé yìwù.
他把帮助他人视为自己的责任和义务。
He regards helping others as his responsibility and obligation.
Tā měi gè yuè dū huì qù shèqū zhōngxīn zuò zhìyuàn zhě, chéngdān yīxiē shèhuì yìwù.
他每个月都会去社区中心做志愿者,承担一些社会义务。
He volunteers at the community center every month to take on some social responsibilities.