Vertisols
变性土
🗣️ 情景例句
I still don't understand what you mean.
我还是弄不懂你是什么意思。
If two men ride on a horse, one must ride behind.
两人同骑一马，必有一人在后。
I don't know. I think he's very old.
不知道。我想他年纪一定很大了。