义务

duty / obligation / CL:項|项[xiang4] / volunteer (work etc)

surname Yi / (Tw) abbr. for 義大利|义大利[Yi4 da4 li4], Italy

justice / righteousness / meaning / foster (father etc) / adopted / artificial (tooth, limb etc) / relationship / friendship

affair / business / matter / to be engaged in / to attend to / by all means

to fulfill one's duty / to work without asking for reward

National Tree Planting Day (March 12th), as known as Arbor Day 植樹節|植树节[Zhi2 shu4 jie2]

civil obligation / a citizen's duty

volunteer / voluntary worker

compulsory education