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| 21. | The valves are connected to dip tubes that run to the cylinder sides. The top valve will have the dip tube in the vapor and the bottom valve will have the dip tube in the liquid. |
| 阀门上连接着汲取管，汲取管伸入到钢瓶内侧。上面的阀门的汲取管处在蒸气里，下面的阀门的汲取管处在液体里。 |
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| 22. | To vomit(ingested matter)or experience vomiting. |
| 呕出（汲取的物质）或呕吐 |
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| 23. | A. WE HAVE TO ACCUMULATE ABUNDANT MATERIALS BEFORE WE WRITE SOMETHING, SAY, LEARNING BY HEART CROWDS OF ARTICLES. |
| 写作需要有很多素材,积累素材很重要.要多背课文. |
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| 24. | draw a moral from a story |
| 从故事中汲取教训 |
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| 25. | learn by one's mistakes |
| 从错误中汲取教训 |
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| 26. | We can draw some lessons for the future . |
| 我们可以为今后汲取教训. |
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| 27. | oil and mixed media on canvas |
| 油彩混合素材布本 |
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| 28. | it is able to get water. |
| 这样它就可以汲取水分。 |
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| 29. | We have to accumulate abundant materials before we write something, say, learning by heart crowds of articles. |
| 写作需要有很多素材,积累素材很重要.要多背课文. |
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| 30. | My life would supply material. |
| 我的生活就会提供素材。 |
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