1. Even a telescope in orbit round the earth, like the very successful Hubble telescope, would not be suitable because of the dust particles in our solar system.
    即使是一台放置在围绕地球的轨道上的望远镜--如非常成功的哈勃望远镜--也因为太阳系中的尘埃微粒而无法胜任。

2. It requires 97 per cent less energy to travel the quarter of a million miles from the Moon to Earth-orbit than the 200 mile-journey from Earth´s surface into orbit!
    因此，从月球到地球的25万英里所消耗的能量要比从地球表面进入地球轨道的200英里所耗能量少97%。

3. The satellite was launched into the orbit around the moon.
    卫星被发射进入绕月球运行的轨道。

4. These mysterious patches of light are still visible today and so bright that they have been seen from U.S. spacecraft in orbit around the earth.
    这些神奇的光带如今仍然可见，而且明亮得连在绕地球轨道飞行的美国飞船里都可以看到。

5. An ocean wave passing through deep water causes a particle on the surface to move in a roughly circular orbit, drawing the particle first towards the advancing wave,
    穿过深水的海浪使水面上的一个微粒按照一种近乎圆形的轨道移动，先把微粒拉向前移动的海浪，

6. Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
    反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，

7. Similarly, our own present primitive chemical rockets, though good enough to orbit men,
    同样，我们目前使用的原始化学火箭，虽然把人送入轨道，