浮筒, or "floating drum," is a buoyant device commonly used in various water-related applications. It is designed to float on the surface of water and can serve multiple purposes, such as marking locations, supporting structures, or aiding in navigation. These devices are often made from materials like plastic or foam, which provide the necessary buoyancy. In marine environments, 浮筒 can be utilized for buoys that signal safe passages or hazardous areas. They are also essential in aquaculture for supporting nets and cages, ensuring that fish and other aquatic life are contained while allowing for water flow and access.