Undercourse
底层, 垫层, 在花砖或瓷砖之下的底层
🗣️ 情景例句
Ready?
准备好了吗？
Naughty boys sometimes make good men.
淘气的男孩有时会成为争气的孩子。
The leader of the party was examining the soil near the entrance to the cave when the machine showed that there was gold under the ground.
当这个队的队长正在检查洞口附近的土壤时，那台机器显示出它的下面埋有金子。