该公司自己开采煤炭、矿石石灰石、火黏土及黄铁矿，自行炼焦，并拥有14英里的配套铁路。

It mined its own coal, ore, limestone, fire-clay, and fire-stone, made its own coke, and owned 14 miles of railway to serve its works.

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因此用火山形成的黏土制做的容器所使用的火必须比那些不是由火山形成的黏土使用的火温度高。

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

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因此用火山形成的黏土制做的容器所使用的火必须比那些不是由火山形成的黏土使用的火温度高。

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

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