So it's a kind of duplicating effect there for companies like Chegg, which is a real problem.

因此，对于像 Chegg 这样的公司来说， 这是一种复制效应， 这是一个真正的问题。

One of the many projects was a bore-mortar weapon that would duplicate the effect  of a tornado and be able to knock aircraft out of the air.

许多项目之一是一种炮弹武器，它可以复制龙卷风的效果，并能够将飞机击飞。