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| an object that moves round a bigger object in space |
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| used for saying sth in a different way |
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| the area beyond the earth round the planets and stars |
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| not easy to believe becouse it is very improbable |
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| get more and more of sth useful ,such as knowledge or experience |
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| what you know and understand about sth |
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| a person who studies the physical world |
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| travel round a place in order to learn about it |
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| a scientific test done in order to learn sth |
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| a carful study of sth in order to explain |
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| say or show that sth is true or definite |
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| it is present in the real world |
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