五百公里的英文怎么写

　　The Hubble telescope orbits about five hundred fifty kilometers above earth.

　　哈勃望远镜轨道位于地球上方550公里左右。

　　The unit of measurement for the y-axis is kilometers.

　　y轴的测量单位是公里。

　　Thus we can see that, on the first day, the pipit flew 20 kilometers.

　　由此可见,第一天,这只鹨飞行了20公里。

　　These years, he has walked about 200,000 kilometers along the border.

　　这些年来,他沿着边境走了大约20万公里。