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| 1. | It is not easy to separate a mixture of liquids into pure substances by fractional distillation.If the |
| 通过分级蒸馏把液体中的混合物分解成纯物质是不容易的。如果这些物质的沸点相近它们就会被一切除掉。 |
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| 2. | We must find a way to separate oil from its mixture. |
| 我们必须想个法子把油从它的混合物中分离出来。 |
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| 3. | It is not easy to separate a mixture of liquids into pure substances by fractional distillation. |
| 通过分级蒸馏把液体中的混合物分解成纯物质是不容易的。 |
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| 4. | We can separate the mixture into the pure chemical compounds of which it is composed . |
| 我们能够把混合无分为构成该混合物的纯化学化合物。 |
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| 5. | The oil and water will separate out if the mixture is left standing. |
| 如果将这混合物直立放置，油与水就会分离。 |
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| 6. | It is not always easy to separate a mixture of liquids into pure substances by fractional distillation |
| 用馏分蒸馏法把液体的混合物分成纯物质，不总是轻而易举的事。 |
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