sine qua non

(fml 文) essential condition; thing that is absolutely necessary 必要条件; 必不可少的事物: Patience is a sine qua non for a good teacher. 做个优秀教师必不可少的条件是要有耐心.

simplification, simplify, simplistic, simply, simul-taneously, simulacrum, simulate, simulated, simulation, simulator, simultaneous, simultaneously, simultaneousness, simul-taneity, sin, since, sincere, sincerely, sincerity, sine, sine die, sinecure, sinew, sinewy, sinful, sinfully, sing, Singapore, singe, singer, singing, single, single out, single-minded, singlet, singsong, singular, singularity, singularly, sinister, sink,