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51. | covering roller |
| 覆土压土轮 |
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52. | covering homomorphism |
| 覆盖同态 |
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53. | covering homotopy |
| 覆盖同伦 |
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54. | covering theorem |
| 覆盖定理 |
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55. | covering manifold |
| 覆盖廖 |
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56. | covering operation |
| 覆盖运算 |
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57. | covering material |
| 被覆物 |
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58. | covering shovel |
| 覆土器|覆土铲|培土松土铲 |
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59. | covering mortar |
| 覆盖灰浆 |
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60. | fabric covering |
| 用胶布作成的外壳 |
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