sine wave
n. 正弦波
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.
正弦波
sine wave
n. 正弦波
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.
正弦波