Stratal
a. 层的, 地层的
🗣️ 情景例句
that will bring parents and teachers together once a week
让家长们及教师每星期一次
Hush! Talk quietly.
嘘！请小声讲话。
We should learn the value of money and learn how many hours' work has to be done before we can buy something.
我们应该认识到钱的价值，知道要干多少小时的活，我们才能买某件物品。