然后在3、4月份出现了蓝——绿藻类这种古老单细胞生物。

Then appeared in the Blue 3,4 - Green algae this ancient single-celled organism.

youdao

然后在3、4月份出现了蓝——绿藻类这种古老单细胞生物。

Then appeared in the Blue 3,4 - Green algae this ancient single-celled organism.

youdao