cannot do so啥意思？

Question

If two engines stop working on the same side,the plane can easily use its other engines to landThere are also two mechanical pilots to fly the plane if the human pilots cannot do so
There are also two mechanical pilots to fly the plane if the human pilots cannot do so这句 这是个啥意思

Answer 1

如果同一边的两个引擎停止运行，飞机将能轻易的使用其它的引擎着陆。
如果飞行员无法继续驾驶飞机，那么也会有两个‘机器人飞行员’（代替飞行员）驾驶飞机。

cannot do so 是 ‘无法做到’的意思
你可以举起那块大石头么？ -Can you lift that big stone?
不，我无法做到。- I cannot do so.
大概就是这个意思吧。。。

Answer 2

cannot do so
不能这样做。
so是指代前面的做法。
There are also two mechanical pilots to fly the plane if the human pilots cannot do so.
飞行员无法驾驶飞机时,有两台机械自动驾驶仪可以操控飞机.

Answer 3

cannot do so 无法那么做

Answer 4

so指代前面的 to fly the plane
cannot do so 等同于 cannot to fly the plane