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UFOs There are many explanations for why UFOs visit the earth. The most popular one is that they may be visitors from other
UFOs There are many explanations for why UFOs visit the earth. The most popular one is that they may be visitors from other
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2013-02-05
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UFOs There are many explanations for why UFOs visit the earth. The most popular one is that they may be visitors from other planets. To fly such aircraft, their builders must develop different forms of viation, because they seem to fly much faster than normal aircraft. The UFOs, it is believed, must contain scientists from other planets who are studying life on earth. It is even believed that several such aircrafts may have landed on earth and the space visitors may be living among us. But there are also less fantastic explanations available. Although some sightings of UFOs are difficult to explain, most can be explained quite easily. In many cases the observers might have made a mistake. They might have seen a weather balloon or an aircraft. Or the light they saw in the sky might have been light from the ground, reflected on the clouds. However, the exact cause of many sightings still remains a mystery.
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专业英语四级
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