“上层的”的英语可以翻译为：[医] supernatant ...

走廊的长度等于房子上层的长度.A hall ran the length of the upper floor of the house.衬衫放在最上层的抽屉里.The shirts go in the top drawer.船的两侧向外展开,以便使上层的船舱宽敞些.The sides of the ship were flared out to allow more room on the top floors....