We have no intuitive grasp of the immensity of time.我们对时间的无限没有什么直观的认识。the immensity of the universe宇宙的浩瀚无垠...the immensity of the nocturnal sky.夜空的浩瀚The immensity of the universe is difficult to grasp.宇宙的浩瀚难以捉摸。I believe...
其轨道速度一定是在每秒几百米。Her orbital speed must be a few hundred meters per second.更为大型的卫星将被送入轨道。Yet bigger satellites will be sent up into orbit.这颗彗星的轨道与地球的轨道交叉。The orbit of this comet intersects the orbit of the Earth....