所以，用火山粘土来烧制容器时，炉窑的温度比普通粘土要求更高。

So the fires to make containers from volcanic clay must be hotter than those used for non-volcanic clay.

youdao

粘土沉积分布在古代的火山表面和坑坑洼洼的高原地区，其中一些显然是最近才由于侵蚀而暴露出来的。

The clay deposits are scattered all over, in ancient volcanic surfaces and heavily cratered highland regions, some of which have apparently been exposed by erosion only recently.

youdao

通常你会在海岛或陆地的低洼处发现品质好的粘土，尤其是在火山喷发后形成的陆地。

You can usually find good clay in low areas of islands or land, especially if volcanoes helped form the land.

youdao