第三人称复数：waterlines
1. (船的)吃水线;(船的)水平线
The waterline is a line, either real or imaginary, on the side of a ship representing the level the water reaches when the ship is at sea.
e.g. Ray painted below the waterline with a special anti-rust paint.
雷用专门的防锈涂料涂船的吃水线以下的部位。
noun
1. a line corresponding to the surface of the water when the vessel is afloat on an even keel
often painted on the hull of a ship
Synonym: water line water level