MOSE project was planned to be built under the sea water to stop floods.Before the gates

题目

MOSE project was planned to be built under the sea water to stop floods.Before the gates
are in use,they are under the sea and full of water.When the flood comes,the water in the gates will be poured out,and then the gates will be filled with air.So the gates can go up with the sea water.再者,不是水都从水闸中被倒出去了吗?怎么又说水闸带着海水上升呢（最好一句）?

答案

浮力,
洪水来的时候,闸门里水被排出,并在闸门里面充满了空气,闸门就会随着海水上升,
就是为了提高闸门,挡住洪水.