OK, so you can't copy a reference to a type whose class is totally unknown at compile time.
因此，不能复制在编译时根本不知道是什么类的类型引用。
To her the outside world was a totally unknown quantity.
对她来说，外部世界完全是个未知数。
Their origins are beyond our knowledge and their future destinations are totally unknown.
我们无从了解他们的出身，也全然不知其未来的归宿何在。
To shanti the outside world was a totally unknown quantity.
对尚蒂来说外面的世界完全是个未知数。
You wonder with some of these totally unknown firms whether they have insurance, whether they're hiring qualified bus drivers, whether they're going to go bankrupt.
不知道其中的一些完全不知名的公司是否有保险，是否雇用到合格的巴士司机，他们是否会倒闭。
Still, I only required to smile at totally unknown people, who unhesitatingly smiled back and welcomed me, a total stranger, not only into their houses, but also into their hearts.
不过，我只需要对陌生的人们投去微笑，他们便会毫不犹豫地回我一个微笑，这样不仅能够走进一个完全陌生的人的家，还能走进他们的内心。
Still, I only required to smile at totally unknown people, who unhesitatingly smiled back and welcomed me, a total stranger, not only into their houses, but also into their hearts.
不过，我只需要对陌生的人们投去微笑，他们便会毫不犹豫地回我一个微笑，这样不仅能够走进一个完全陌生的人的家，还能走进他们的内心。
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