Packstone
泥粒灰岩
🗣️ 情景例句
I am planning to write an editorial that I think will help you.
我计划写一篇社论， 我认为应该能帮助你们。
A book that remains shut is but a block.
有书闭卷不阅读，无异是一块木头。
as the wave leaves the particles behind back to its starting point again.
当波浪把微粒留在身后时又回到出发点。