N-COUNT 牙仙（传说中如果儿童把脱落的牙齿放在枕下，牙仙会在他们睡着时把牙齿取走，留下硬币） The tooth fairy is an imaginary creature. Children are told that if they put a tooth that comes out under their pillow, the tooth fairy will take it away while they are sleeping and leave a coin in its place. 牙仙（传说中如果儿童把脱落的牙齿放在枕下，牙仙会在他们睡着时把牙齿取走，留下硬币）