airbed
noun (British English)(also air bed North American English, air mattress North American English, British English)
a large plastic or rubber bag that can be filled with air and used as a bed 充氣床墊 
You can sleep on the airbed. 你可以睡在充氣床上。 She was lying on an airbed in the swimming pool. 她躺在遊泳池的充氣床上。