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| 71. | There is usefulness to the parachute. |
| 降落伞是有用的。 |
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| 72. | spectral luminous efficacy |
| 光谱光视效能 |
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| 73. | It is of the greatest usefulness. |
| 它是极有用的。 |
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| 74. | test the efficacy of a new drug |
| 测试新药的效能. |
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| 75. | anything of material value or usefulness. |
| 任何有实际价值或使用价值的东西。 |
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| 76. | Retaining color, freshness, value, or usefulness. |
| 不褪色的保持颜色、鲜艳、价值或用途的 |
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| 77. | The institution has survived its usefulness. |
| 这种制度因过时而失去其存在的意义。 |
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| 78. | fire-fighting capability |
| 灭火效能；灭火能力 |
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| 79. | The legislation has outlived its usefulness. |
| 这一法规已失去效用了。 |
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| 80. | forecasting performance of mode |
| 模型的预测效能 |
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