gōng / chǎng / xū / yào / xiān / jiǎn / cè / bīng / jīng / shí / de / chún / dù / zài / tóu / rù / shēng / chǎn / 。工厂需要先检测冰晶石的纯度,再投入生产。The factory must test the purity of the cryolite before using it in production.