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| 21. | The patient hounds lay down again in the soft red rust and looked up longingly at the swallows circling in the gathering dusk. |
| 那一群猎犬也就在那软红土上坐了下来，馋涎欲滴地望着一群在暮色苍茫中盘旋的燕子。 |
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| 22. | Once established, early rust increase is logarithmic. |
| 一旦定殖后，早期锈菌的增长是对数性质的。 |
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| 23. | This preparation consists of sanding away any paint or rust to obtain a smooth but not highly polished surface. |
| 准备工作包括用砂纸打磨，除去油漆和锈迹，以使表面光滑但又不抛得很光。 |
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| 24. | Oil it regularly to prevent rust. |
| 经常擦油，以免生锈。 |
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| 25. | Oil preserves metal from rust. |
| 油保护金属免于生锈。 |
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| 26. | The rain will rust the iron roof. |
| 雨水将使铁皮屋顶生锈。 |
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| 27. | She scraped the rust off the kitchen knife. |
| 她擦掉了菜刀上的锈。 |
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| 28. | Weekly observation in a wheat field might give the following observations on stem rust during the course of an epidemic. |
| 在秆锈病的流行过程中，每周在小麦田中进行观测，得到如下结果。 |
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| 29. | Brass doesn' t rust. |
| 黄铜不生?. |
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| 30. | The underneath of the car was covered with rust. |
| 汽车底部锈迹斑斑。 |
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