Eurypterida
板足鲎类
🗣️ 情景例句
Yes, we did.
确实如此。
Please call me if you have any problems.
如果你有难题，就请打电话给我吧。
I've got a problem and as I don't know what to do I thought I'd write to you and ask for your advice.
我有一个问题，因为我不知道该怎么办。我想我最好写信给你，征求你的意见。