这是一种世纪工业，由世界最古老的食品法——1516 年《德国啤酒纯度法》指导的工业。

This is a centuries-old industry, governed by the world’s oldest food law, the 1516 Reinheitsgebot (purity law).

youdao

评论：对于非腐蚀性和高纯度产品，这是一种非常可靠的阀门。但是，它的设计使得它不适合用于腐蚀物和超高纯度产品。

Comments: this is a very reliable valve for non-corrosive and high purity products. However, the design makes this valve inappropriate for corrosives and ultrahigh-purity products.

youdao

颜色的强度是产品纯度的一种量度。

The intensity of the colour is a measure of the purity of the product.

youdao