快乐

happy; up; gay; glad; jolly; joyful; cheerful; delighted; merry; blissful; pleased; gaiety; happily; joyfully; cheerfully; gaily; merrily; happiness; joy; pleasure; fun; cheer; delight; enjoyment; cheerfulness; merriment; felicity; gladness; enjoy; entertain; rejoice; gladden; with pleasure

男生

schoolboy; boy; male student

唱歌

sing; chant; carol; vocalize; sing a song; vocal; singing; song; vocalization