n.坚硬粘土岩

Bina: You know, I've been to China. 比娜：说起来，我还去过中国呢。

Bina: I hope you will. I'll write to you. 比娜：我希望你跟我联系。我会给你们写信的。

Bina: By the way, where are you from? 比娜：顺便问一句，你是哪里人？

Bina: Yes, I am. Have you been to Vancouver before? 比娜：是啊。你以前去过温哥华吗?

Bina: I agree. And it always relaxes me. 比娜：我同意你的看法。而且我总是能得到身心的松弛。