Once common functions are written in assembly language they could then be copied into a new program without having to be written again.

一旦用汇编语言来编写公用程序，它们就不必重新书写而可被复制到新的程序中去。

youdao

The bottom functions usually don't need to be modified after written. But the control programs usually have to be written again when the control process changed.

控制器底层函数在编写成功后一般不再修改，但是上层控制程序却需要随着控制流程的改变而重新编写。

youdao

The bottom functions usually don't need to be modified after written. But the control programs usually have to be written again when the control process changed.

控制器底层函数在编写成功后一般不再修改，但是上层控制程序却需要随着控制流程的改变而重新编写。

youdao