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| 51. | Draw a diagonal line to divide the square into two triangles. |
| 画一条对角线,把正方形分成两个三角形。 |
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| 52. | a square has four sides, a cube six. |
| 正方形有四个边, 立方体有六个面。 |
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| 53. | the sail above the royal on a square-rigger. |
| 在正方形机身上的最上桅的帆。 |
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| 54. | Th two diagonals of a square cross in the centre. |
| 正方形的两条对角线在中间相交。 |
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| 55. | Draw a square with the line" XY" as its base. |
| 以直线“XY”为基线画一正方形。 |
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| 56. | Each couple stands on one side of the square. |
| 每对男女都站在正方形的一条边上， |
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| -- 来源 -- 英语晨读30分（高二） - 79 Square-dancing |
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| 57. | you can compute the area of a square if you know the length of its sides. |
| 正方形的两条对角线相等,。 |
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| 58. | I'm rarely aware that the square area is bare. |
| 我很少觉察到那个正方形区域是光秃秃的. |
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| 59. | A square has four corners ; a cube has eight. |
| 正方形有四个角儿; 立方体有八个角儿. |
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| 60. | A square has four sides but a circle has no sides. |
| 正方形有四条边，而圆形没有边。 |
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