All HA's showed a loose spongy structure with a large number of internal Spaces.

所有腐植酸都有疏松的海绵结构，同时有大量的内部空间。

youdao

All HA's showed a loose spongy structure with a large number of internal Spaces.

所有腐植酸都有疏松的海绵结构，同时有大量的内部空间。

youdao