Pumicing
v. 浮岩, 浮石, 轻石（轻而多孔, 可以去除皮肤污垢或使皮肤光滑, 其粉剂可作清洁剂或抛光剂）( pumice的现在分词 )
🗣️ 情景例句
A man can develop his mind by reading.
读书增进个人的智慧。
Let's cross the bridge when we come to it.
既来之，则安之。
That's international practice. We can't break it.
这是国际惯例，我们不能违背。