As an important natural resource, salt once have a special achievement in the evolution of human civilization.

盐作为一种重要的自然资源，在人类文明的演进中，有过特殊功绩。

youdao

As an important natural resource, salt once have a special achievement in the evolution of human civilization.

盐作为一种重要的自然资源，在人类文明的演进中，有过特殊功绩。

youdao