护短是交换机的升级可能会非常困难。

May justify the upgrade switch be very difficult.

如果弗雷德五点钟以后走护短，现在还不可能到家。

If Fred didn't leave till five o 'clock, he can't be home yet.

有位十分宠爱儿子的母亲，儿子小时偶尔打架偷东西，她都护短，说：“孩子还小，不懂事！

Once there was a mother who adored and spoiled her son. When he was little, he would sometimes fight or steal, but she would defend him, saying, "He's still young and doesn't understand anything."