The sensor consists of two sets of quartz wedges which are respectively right-handed and left-handed with equal angle.

传感元件为两套楔角相同的左旋和右旋石英光楔。

youdao

Compounded from violet-golden clay and a mixture of burnt feldspar, limestone, quartz and plant ash, the glaze is prepared from recipes that have often been handed down for generations by teachers or within families.

UNESCO: Culture