1·党项是活动在我国西北地区的游牧民族之一，于1038年至1227年间以银川为中心建立了雄强一时的西夏王朝。
As one of the active nomadic nations in the Northwest of China, the Tanguts founded the Western Xia Dynasty centering now Yinchuan from 1038 to 1227 in the history.
2·float的最大值约为 3.4*1038。 这个值还不足以表示某些东西，比如宇宙中的电子数目。
The maximum value of a float is about 3.4*1038, which isn't large enough for some things you might wish to represent, such as the number of electrons in the universe.