| 1. | She's a carbon copy of her sister. |
| 她跟她姐姐一模一样。
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| 2. | Make three carbon copies of the letter. |
| 把这信复制三份。
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| 3. | You receive the top copy of the receipt, and we keep the carbon . |
| 你把这收据上面的原件收下,我们保留下面的复写件。
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| 4. | Carbon has a valence of four. |
| 碳的化合价是四价。
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| 5. | Carbon has 4 valencies. |
| 碳的化合价是四价。
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| 6. | The lungs absorb oxygen from the air and give the blood the oxygen it needs and relieve it of carbon dioxide. |
| 肺从空气中吸入氧气，为血液提供所需要得氧气，并帮助排除二氧化碳。
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| 7. | Carbon dioxide attacks the lining of your stomach. |
| 二氧化碳会侵蚀胃臂。
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| 8. | Carbon showed a presence of 40 percent in the samples tested. |
| 碳在测试的样品中显示有40%的存在率。
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| 9. | C is the symbol of carbon . |
| C是碳元素的符号。
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| 10. | They heavy traffic tinctures the air with carbon monoxide. |
| 大量的来往车辆使空气中充满了一氧化碳。
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