铜盘的内面应涂上一层银、镍或锡。

Copper pans should be lined with silver, nickel, or tin.

youdao

另外，对现有的银铜类合金接触线应改善它的平直度，以降低离线率，使质量达到国外同类先进产品的水平。

It must improve the regularity of the present cupreous alloys in order to reduce the rate of contact loss and make its quality reaches up to the level of excellent overseas congeneric product.

youdao

这种状态在下步火法熔炼时会造成损失， 因此应首先转化为单质银。

In order to avoid loss of silver in the subsequent smelting stage, the state of AgCl should be changed to elemental silver.

youdao