Arenigian
[地质]阿仑尼克阶(早奥陶世晚期)
🗣️ 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
If I had known that, I could have helped you.
假如我早知道，我就能帮你了。
I don't know. My head hurts.
不知道。我头痛。