“一层”怎么读？

“一层”的英语可以翻译为：a layer or deck，one story or floor (of a multi-story building)，a stratum，a bed，bed ...

电梯嘎吱一声停在了一层。The elevator creaked to a halt at the ground floor.她胳膊下侧有一层肥肉一颤一颤的。A roll of fat jiggled on the underside of her arm.池塘表面有一层黏腻腻的污泥。There was an unappealing film of slime on top of the pond....