"Our Navy can carry twice as many aircraft at sea as all the rest of the world combined," outgoing U.S. Secretary of Defense Robert Gates pointed out last year.
When inactive, the gates will lay flat on the seafloor; when water levels rise, they will be pumped full of air and rise above the surface to block sea water.
平时，闸门平铺在水底；在海水上涨时，闸门被注满空气，浮到水面阻隔海水。
3
Then the gatesof his heart were flung open, and his joy flew far over the sea.