Waymark
n. 路标
🗣️ 情景例句
What is wrong with you?
你怎么啦？
I should have studied last night, but I was too tired.
我昨晚应该学习，但是我太累了。
It was from the study of these that so much was learnt about the interior of the earth.
正是从这两种波的研究中，我们可以了解到地球内部的许多情况。