Balkstone
含杂质的层状灰岩
🗣️ 情景例句
It's good that you went back.
你回去是对的。
I don't know what you're thinking!
真不知道你是怎么想的！
We have learnt to expect that trains will be punctual.
我们已经习惯于相信火车总是准点的。