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| 1. | X-radiography has sometimes been used with success to detect bedding structures and bioturbation in apparently |
| X射线照片有时已成功地用来发现外表均一的砂岩中的层次构造和生物扰动。 |
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| 2. | Quite often it is found that in an apparently uniform piece of rock the thermal conductivity differs |
| 一块看来很均匀的岩石试件，却经常发现它每一厘米的热导率都不一样。 |
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