非递归的
non recursive discrete time system 非递推离散时间系统
If we hadn't defined F(0) and F(1) non recursively, you'd never get a solution any number because you'd reach 0 and then you'd go into negative numbers. 要是前面没有定义F(0)和F(1)的话，它下探到0之后就会进一步到负数，你就永远都得不到结果了。
Our first meeting often recurs to me/my mind. 我们初次见面的情形时常浮现於我的脑海。
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 memory of the days we spent together often recurs to me. 我们当时在一起的情景现在还时常浮上我的心头。
