n a long fishing line with many shorter lines and hooks attached to it (usually suspended between buoys)
n a conical fishnet dragged through the water at great depths
v fish with trawlers
n. 拖网( trawl的名词复数 ); 排钩绳
v. （在…）以拖网捕鱼( trawl的第三人称单数 ); 查阅（档案等）