Bittern is a by-product of seawater salt industry.

苦卤是海水制盐工业的副产物。

The population of the bittern in the area has been drastically reduced by overhunting.

该地区的麻鸦数量因过度捕杀而急剧减少。

Bittern is often used as a coagulant for tofu.

盐卤多被用来作为豆腐的凝固剂。

The hollow-sounding bittern guards its nest;

麻鸦守着鸟巢空空地叫；

And the plan of bittern replaced salt was put forward.

提出了以卤代盐制碱的设想。

The boric recovery from a bittern liquid was investigated.

论述了从卤水中回收硼的试验研究情况。

Secondly, the quality of bittern has been greatly improved.

其次，使卤水净化质量有了根本的提高。

It was confirmed by the variation of concentration of bittern.

卤水浓度的变化就证实了这一点。