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| 71. | noxious emissions |
| 有害排放物 |
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| 72. | irrespirable atmosphere |
| 井下有害空气 |
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| 73. | a pernicious haBit |
| 有害的习惯 |
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| 74. | threshold of adverse effect |
| 有害作用阈 |
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| 75. | noisome fumes. |
| 有害的气体 |
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| 76. | deleterious dust |
| 有害尘末 |
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| 77. | Do harm to |
| 损害，对……有害 |
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| 78. | injurious impurity |
| 有害不纯物 |
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| 79. | Smoking is harmful to your health . |
| 抽烟有害健康。 |
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| 80. | A harmful action; an injury. |
| 有害行为；伤害 |
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