The only_from line defines an access restriction.

only _ from行定义一个访问限制。

youdao

Using the NOT operator, further restriction can be placed on access control.

可以使用NOT 操作符对访问控制进行进一步限制。

youdao

Using the NOT operator, further restriction can be placed on access control.

可以使用NOT 操作符对访问控制进行进一步限制。

youdao