Found outside Baghdad, Iraq in 1936, the Baghdad Battery is a small clay jar containing an iron rod suspended in a copper cylinder which is soldered shut and sealed with asphalt.

1936年在伊拉克巴格达郊外发现的巴格达电池由一根小铁棍悬空在一个由沥青密封的铜制容器中，该容器置于一个陶土罐里。

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The containers should be made of dark glass or fired clay. Containers made of iron or copper will ruin fats and oils.

容器应由深色的玻璃或陶瓷做成，因为铁制或铜制的容器会使油脂变质。

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A flat blade of iron passed beneath it, and lifted it, and tossed it into a cart with other lumps of clay, and it was carried far away, as it seemed, over a rough and stony road.

一铲下去，它被挖了起来，然后和别的泥土一起装到一辆车上，沿着一条似乎很不平坦铺着石块的路，运到遥远的地方去。

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Different kinds of clay contain different minerals such as silicon or iron dioxide.

VOA: special.2009.09.09

Chagall welcomed the Russian revolution, but found himself a clay jug among iron pots.

ECONOMIST: Marc Chagall

Two of the most persistent, though, are that clay was the catalyst, and that iron and nickel sulphides were the catalysts.

ECONOMIST: The origin of life