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9. pure adj. 纯净的

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8. freezing adj. 冰冻的

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7. solid n. 固体

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6. relative adj. 相对的

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5. oxygen n. 氧气

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4. hydrogen n. 氢

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3. range vi.& n. 变动

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2. transport n. & vt. 运输

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1. sailor n. 水手

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8.  From the late eighteenth century to well into the

   nineteenth century different people struggled for their

   rights.

   ☆重点词汇☆

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