Biochronostratigraphic
生物年代地层的
🗣️ 情景例句
I'm so sorry.
很抱歉。
If I had known that, I could have helped you.
假如我早知道，我就能帮你了。
My dentist had just pulled out one of my teeth and had told me to rest for a while.
我的牙科医生刚刚给我拔掉了一颗牙，叫我休息一会儿。