quaalude

['kweilu:d]

n. [药]安眠酮[商标名]

例句与用法：

Agreement by the management is a sine qua non of all employment contract.

管理部门的同意就是所有雇用合同的必要条件。

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。