The spin of the electron was not established at that time.

电子自旋的概念在当时还没有建立起来。

youdao

Strike direction is not established .

地层走向不能确定。

youdao

And the system of historiography is still not established.

门类不具，史学体系尚未建立。

youdao

And the system of historiography is still not established.

门类不具，史学体系尚未建立。

youdao