sine
[sain]
n.[数]正弦
例句与用法：
The hearing is adjourned sine die.
审讯被无限期地推迟。
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：
n.
【数】正弦