英语语法分析

Fine structure of faculae.

光斑的精细结构。

These faculae frequently are the forerunners of sunspot formation.

这些光斑常常是形成太阳黑子的先兆。

These faculae frequently are the forerunners of sunspot formation .

这些光斑常常是形成太阳黑子的先兆。