In the Chinese language, there are some very special words composed of two characters, and If the order of the characters is reversed, the meaning of the new word BA is just for the use of the word AB.
BA≠AB but BA is for the use of AB
Examples:
羊圈 a sheepfold; a sheep-pen; a sheepcote 《=》 圈羊 to pen the sheep
铺盖 bedclothes《=》盖铺 to cover sth. with
铁锤 Hammer《=》锤铁 to hammer iron
门锁 locker 《=》锁门 to lock the door
锅盖 pot cover《=》盖锅 to cover the pot
瓶塞 bottle plug 《=》塞瓶 to plug the bottle
牙刷 teeth brush《=》刷牙 to brush the teeth
床罩 a bed cover《=》罩床 to cover the bed
See also:
手套 glove《=》套手 to cover hands
口罩 mask《=》罩口 to cover the mouth
鞋垫 insole《=》垫鞋 to pad the shoes
水车 waterwheel《=》车水 to draw water with the waterwheel
风扇 fan, blower《=》扇风 to fan the air
奶牛 milking cow《 =》牛奶 milk
蜜蜂 a honey-bee《 =》蜂蜜 honey
鱼网 fishing net《=》网鱼 to fish
笔架 pen holder《=》架笔 to hold the pen