Undercourse
底层, 垫层, 在花砖或瓷砖之下的底层
🗣️ 情景例句
What makes you work so hard?
什么使你这样卖命？
Our company is one of the big names and has a long tradition.
我们是一家久负盛名，有着悠久历史的公司。
Was the noise a cause of the illness, or were the complaints about noise merely a symptom?
是噪音引起了（精神）病呢，还是（精神）病的症状之一是对噪音的抱怨？