The first revolution happened when nicolaus copernicus no longer saw the earth as a motionless point at the centre of the universe but as moving in “ revolutions ” , or circles , around the sun 当尼古拉斯?哥白尼不再把地球看作是宇宙中心一个静止不动的点，而是围绕太阳作旋转运动，或者可以说是绕着太阳转圈时，第一场革命爆发了。
As it follows the earth s rotation closely , it is stationary relative to the earth s surface hence the name geostationary . this enables it to view , and obtain images of , the same part of the earth all the time 这颗卫星紧随地球的自转而运行，相对于地面是静止不动的(故名地球同步卫星) ，因此可以24小时不断拍摄地球上同一地区的云图。
As it follows the earth s rotation closely , it is stationary relative to the earth s surface ( hence the name geostationary ) . this enables it to view , and obtain images of , the same part of the earth all the time 这颗卫星紧随地球的自转而运行，相对于地面是静止不动的(故名地球同步卫星) ，因此可以24小时不断拍摄地球上同一地区的云图。
As it follows the earth s rotation closely , it is stationary relative to the earth s surface ( hence the name geostationary ) . this enables it to view , and obtain images of , the same part of the earth all the time 这颗卫星紧随地球的自转而运行，相对于地面是静止不动的(故名地球同步卫星) ，因此可以24小时不断拍摄地球上同一地区的云图。
It should be realized that when we assign a magnitude and direction to the velocity of a body , we are really expressing its velocity relative to something which is , for this particular purpose , imagined to be stationary 句子翻译：应当认识到，当我们确定某一物体的速度大小和方向时，实际上我们表示的是相对于某一参照物的速度，对于这一特定场合来说，可以设定该参照物是静止不动的。
