This unusable belvedere was razed to the ground by workers.

这座无法使用的观景台被工人们夷为平地。

My pen was broken by my daughter and unusable.

我的钢笔被女儿摔坏了，不能用了。

The unusable computer has been thrown away by the man.

这个男子已将无法使用的计算机扔掉了。