广播电视英语短句 第 290 课：找到粘土-3

In many countries, clay was formed from volcanoes. 在很多国家，粘土是由火山形成的。

This kind of clay usually contains many minerals. 这类的粘土通常含有很多矿物质。

So the fires to make containers from volcanic clay must be hotter than those used for non-volcanic clay. 用火山粘土来进行容器制作所需的火，其温度一定要高于使用非火山粘土来进行容器制作的温度。

The fires may be as hot as one thousand four hundred degrees Celsius. 可能达到 1400 摄氏度 。

It is also important to dry the clay containers slowly. 慢慢地将粘土容器进行干燥处理也是很重要的。