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| 51. | Some consist mostly of blue stars and puffy clouds of gas, but little dust. |
| 有些主要由蓝星和蓬松的气体云组成，几乎没有尘埃。 |
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| 52. | antifriction material |
| 减摩材料;耐摩材料 |
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| 53. | source and special material |
| 源材料和特种核材料 |
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| 54. | This material outwears all others. |
| 这种材料比其它所有材料都耐用。 |
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| 55. | Material used for soundproofing. |
| 消音材料用于隔音的材料 |
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| 56. | Her hair was torn and ragged, and her arms were bound to her sides with sashes and handkerchiefs. |
| 她头发蓬松披散，两臂用带子和手巾捆在身体两侧。 |
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| 57. | low expansion material |
| 低膨胀材料;低膨胀系数材料 |
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| 58. | According to the function mechanisms, polymeric noise reduction composites were classified as vibration damping, sound absorption and sound insulation materials. |
| 降噪材料按降噪机理可分为阻尼减振材料、声材料和隔声材料。 |
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| 59. | cost of material handling |
| 材料管理成本|材料搬运成本 |
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| 60. | Pressure Boundary material - metallurgy of the castings and components. |
| 压力界面材料:铸件和部件材料。 |
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