有一件作品在双子塔里随他一起被毁了，而另一件完全一样的复制品放在家人的住所里，因而幸免于难。

One of them perished with him in the towers but another exact copy was at a family member's house and was saved.

youdao

When I talked about mitosis, I talked about cells making perfect copies of each other, so each parent cell becoming two daughter cells that are the same.

我讲有丝分裂的时候,谈到过细胞能够完美的复制自己,母细胞分裂成为,两个完全一样的子细胞

耶鲁公开课 - 生物医学工程探索课程节选