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The color black was originally referred to as a skin color because Lord Baos skin was black. The color black became a symbol of fairness and impartiality. With time, the black mask ...
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Where does Henry go? What does he want? He goes to a tailors shop and wants to have a suit coat. What do the clerks show Henry at first? Why? They show him ready-made suits, because...
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过去将来时表示在过去某一时间将要发生的动作或存在的状态。 过去将来时常在主句谓语动词为过去时态的宾语从句中。 过去将来时句子中...
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Some sentences have an implied meaning which is not clearly stated. This implied meaning often indicates peoples feelings, attitudes, or motives. You can find this implied meaning b...
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Some error messages will be displayed, but you can ignore them, because well correct them in the subsequent steps. 这将显示一些错误消息，但您可以忽略它们，因为我...
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In the zero-gravity world, there are no ups or downs. The astronauts can sleep anywhere facing any direction. But its not good to be floating away somewhere while sleeping. So the a...
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Mars is a cold, bleak wasteland, with very thin air that we Earthlings could never breathe. However, many of the pictures our telescopes, orbiters, and rovers have sent back show si...
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A spacecraft generally gets its energy from at least one of three power sources: the Sun, batteries or unstable atoms. To choose the best type of power for a spacecraft, engineers c...
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1. What do you think are the main reasons for space exploration? 2. If you are the author, what will you write in each paragraph? A. Although scientists try to make sure nothing goe...
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We live on a planet called Earth that is part of our solar system. But where is our solar system? Its a small part of the Milky Way Galaxy. A galaxy is a huge collection of gas, dus...
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