“一层”的拼音为：yī céng...

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....

“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 ...