Regolith
n. （=mantlerock）[地质]风化层, 土被
🗣️ 情景例句
Then an adult must sign for you.
那就必须有一位成年人来替你签字。
May I help you?
要我帮忙吗？
Excuse me. Where's the toilet, please?
请问洗手间在哪？