sine qua non
[sinei kwɑ: 'nəʊn]
n. 必要条件, 要素
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。
详细释义:
ph.
【拉】必要的条件; 必不可少的事物