上面明亮的北斗七星名字依次是:天枢,天璇,天玑,天权,玉衡,开阳,摇光。
The bright dipper stars above are named Dubhe, Merak, Phecda, Megrez, Alioth, Mizar, and Alkaid.
这种“光的出现”在夜晚,其特性象七色彩带横卧天际,从地平线的这一端延伸到另一端,看起来就象彩练当空舞。
This “light show” features colorful ribbons of light in the night sky.
光穿过只有八千分之一英寸长的试样需要七微秒,而在空间真空中,光在同样长的时间内可能会行驶一英里多。
Light takes seven microseconds to cross a sample only eight thousandths of an inch long; in the vacuum of space, light would go more than a mile in the same time.
应用推荐