二次曲線

quadratic curve (geometry) / conic

two / 2 / (Beijing dialect) stupid

quadratic curve / conic section (geometry)

second (i.e. number two) / second time / twice / (math.) quadratic (of degree two)

next in sequence / second / the second (day, time etc) / secondary / vice- / sub- / infra- / inferior quality / substandard / order / sequence / hypo- (chemistry) / classifier for enumerated events: time

surname Qu

bent / crooked / wrong

tune / song / CL:支[zhi1]

variant of 麴|曲[qu1]

yeast / Aspergillus (includes many common molds) / Taiwan pr. [qu2]

curve / curved line / indirect / in a roundabout way

thread / string / wire / line / CL:條|条[tiao2],股[gu3],根[gen1] / (after a number) tier (unofficial ranking of a Chinese city)