西班牙地中海海岸边的居民主要是以捕鱼为生。他们在沙滩隔成的浅海湾中捕鱼。但怎样防止鱼儿跑到大海中去呢?西班牙的科学家提出用空气泡构成浅海湾同大海之间的一道“篱笆”。在水底设置一些多孔管,用空压机向多孔管中压入空气。空气泡从多孔管中冒出来形成一道屏障,它对行船无妨 Residents of Spain’s Mediterranean coast live mainly on fishing. They fish in the shallow bay separated by a beach. But how to prevent the fish from going to the sea? Spanish scientists proposed using air bubbles to form a “fence” between shallow bays and the sea. Set some porous tubes on the bottom of the water and press the air into the perforated tube with an air compressor. Air bubbles emerge from the perforated pipe to form a barrier that is OK on the boat