adj.不可逆的；不反转的；不可转换的；不能互换的
This non sequitur invalidates his argument. 他不根据前提推理因而论证无效。
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。
The diplomat was declared persona non grata. 这位外交家被宣布为不受欢迎的使节。
An order or command reversing another one. 收回成命的命令与另一个相反的定货或命令
He is declared personal non grata and forced to leave the country. 他被宣布为不受欢迎的人而被迫离开该国。
non reversing 不可逆的(不反转的
