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A)The way we live will also be affected. We shall work shorter hours and have more time for leisure. There will even be no need to travel to work.
B) Even though asteroids(小行星) are very small and very faint, astronomers have learned a great deal about their sizes by using a variety of direct and indirect techniques. For example, it is known that the brightness of many asteroids varies periodically
B) Even though asteroids(小行星) are very small and very faint, astronomers have learned a great deal about their sizes by using a variety of direct and indirect techniques. For example, it is known that the brightness of many asteroids varies periodically
A)The way we live will also be affected. We shall work shorter hours and have more time for leisure. There will even be no need to travel to work.
B) Even though asteroids(小行星) are very small and very faint, astronomers have learned a great deal about their sizes by using a variety of direct and indirect techniques. For example, it is known that the brightness of many asteroids varies periodically
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