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. But it was still too short a period for men to base a calendar on.
    但时间依然太短，人们无法以此为据制定历法。

3. But by the time Julius Caesar became the ruler of the Roman Empire, the calendar had been very badly mixed up.
    到了恺撒大帝成为罗马帝国统治者的时候，历法已经变得混乱不堪。

4. We use the lunar calendar.
    我们采用阴历。

5. They accurately predicted solar eclipses.
    他们精确地预告了日蚀。

6. They have a solar water heater.
    他们有个太阳能热水器。

7. They have a solar water heater.
    他们有个太阳能热水器。

8. The Moon is likely to become the industrial hub of the Solar System, supplying the rocket fuels for its ships, easily obtainable from the lunar rocks in the form of liquid oxygen.
    月球很可能成为太阳系的工业中心。从月球上的岩石中很容易提炼出液态氧，作为航天飞船的燃料。

9. There is a wall calendar near the windows.
    靠窗有一本挂历。

10. To answer questions like these we look at a calendar.
    我们要看日历来回答类似的这些问题。