Undercourse
底层, 垫层, 在花砖或瓷砖之下的底层
🗣️ 情景例句
But the only time he's available this week
但这星期他有空的时间只有
My brain doesn't seem to be working well today.
我的头脑今天好像不太灵光。
Sparks were emitted from small black boxes and red lamps flashed on and off angrily.
小黑盒子里迸出火花，红色灯泡发怒似地忽明忽暗。