海かい流りゅう瓶びんかいりゅうびんMeanings1noundrift bottleA bottle released into the sea to study ocean currents, often containing a message or tracking information.海かい流りゅう瓶びんを海うみに流ながして、海かい流りゅうの動うごきを調しらべる。They release drift bottles into the sea to study the movement of ocean currents.
