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| 51. | The bird hopped up onto the windowsill, looking for crumbs. |
| 鸟儿跳上了窗台寻找面包屑。 |
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| 52. | close-packed structure |
| 密堆积结构 |
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| 53. | banking process |
| 堆积过程 |
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| 54. | She painted the window sills a bright colour. |
| 她把窗台漆上鲜艳的颜色。 |
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| 55. | His feet found the window-ledge. |
| 他的双脚触到了窗台。 |
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| 56. | accumulation plain |
| 堆积平原 |
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| 57. | accretional ice sheet |
| 堆积冰盖 |
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| 58. | The porosity for cubical packing (the least compact arrangement) is 47.6 per cent, and that for rhombohedral (the most compact arrangement) is 25.96 per cent. |
| 立方形堆积（最不松散的堆积）和孔隙度为47.6%，菱形堆积（最紧密堆积）的孔隙度为25.96%。 |
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| 59. | It was only a hop to the window. |
| 只一跳就跳上了窗台。 |
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| 60. | Archives of courts pile up |
| 谳牍堆积 |
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