salt by vacuum

• 真空制盐

salt by vacuum的用法和样例：

例句

1. The brine decontamination is very important to vacuum salt production and this paper had made descriptions for the methods of brine purification.
   卤水净化是真空制盐的一个重要生产环节，该文针对石膏型卤水的处理提出了对卤水净化的一些看法，供盐业同仁讨论。