“下层”造句
由于存在着危险的
下层逆流，在大部分海岸线附近游泳都不安全。
Dangerous undertows make swimming unsafe along most of the coastline.
总的来说，
下层民众被认为是传统的保持者。
Generally, the lower classes are considered to be the bearers of tradition.
毛毡的上层应与
下层重叠。
The upper layer of felt should overlap the lower.