It can be restricted to a range of IPs if desired.

如果需要，可以限制IP范围。

Free access will be restricted to a few hours a day.

免费接入只限于每天数小时。

But ambiguity need not be restricted to conditions of one variable.

但是对于某个变量的条件产生的模糊性是应该限制的。

Education should not be restricted to any one specific age group.

教育不应限制在任何特定的年龄组上。

The title of Royal Highness was to be restricted to the Duke alone.

殿下的头衔仅仅授予了公爵一个人。