最早的陶瓷制品是在制陶的温度下烧制的，但是早在公元前15世纪，（人们）已经用高温烧制表面上釉的炻器。

The earliest ceramics were fired to earthenware temperatures, but as early as the fifteenth century B.C., high-temperature stonewares were being made with glazed surfaces.

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他们展出了一些上釉的陶器。

They displayed some bowls of glazed earthenware .

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这坭兴陶是不上釉的。

Nixing pottery is never glazed.

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