Chertification
[地质]燧石化
🗣️ 情景例句
OK. Keep those knees up.
好 ，膝盖抬高。
Thank you for meeting me.
谢谢你来见我。
Yes, they're our new reading books. Is the box too heavy?
对，这些是我们的新教科书，这个箱子重吗？