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| 31. | Because most of the 2000 minerals are rare and of interest mainly to specialists. Only tens of them are abundant in the earth, and of the tens of minerals, only ten minerals are most frequently encountered. |
| 在这2000多种矿物中，多数矿物较为罕见，且只有矿物专家才对它们感兴趣，在地球上，只有几十种矿物含量丰富，而其中又只有十余种矿物较为常见。 |
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| 32. | Cool weather is forecast for tomorrow. |
| 天气预报明天较为凉爽。 |
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| 33. | Annie: This fortune is really rare. |
| 安妮：这种幸运实属罕见! |
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| 34. | This problem is not comparatively important. |
| 这个问题较为不重要。 |
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| 35. | A Most Unusual Animal |
| 一种极其罕见的动物 |
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| -- 来源 -- 天宝物华（上） - A Most Unusual Animal |
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| 36. | An eclipse of the moon is a rare phenomenon. |
| 月蚀是罕见的现象. |
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| 37. | This variety is rare. |
| 这种变化是罕见的。 |
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| 38. | live in relative comfort |
| 生活得较为舒适 |
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| 39. | Sloppy lower-case ones are becoming a rarity. |
| 随随便便的小写字母越来越罕见。 |
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| 40. | The basic process is more popular . |
| 碱性法较为常用。 |
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