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ductless

/ˈdʌktləs/ /ˈdʌtləs/

Meanings

adjective

无导管的,无管的

Examples :

"The new refrigerator is ductless, so it doesn't need to be connected to a wall vent. "
这款新冰箱是无管的,所以不需要连接到墙上的通风口。