二进宫

name of a famous opera / (slang) to go to jail for a second offense

two / 2 / (Beijing dialect) stupid

binary (math.)

to go forward / to advance / to go in / to enter / to put in / to submit / to take in / to admit / (math.) base of a number system / classifier for sections in a building or residential compound

to enter the emperor's palace / (slang) to go to jail

surname Gong

palace / temple / castration (as corporal punishment) / first note in pentatonic scale