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| 51. | This kind of poisonous gas will not spread and distinguish easily so be easy to avoid being seen, but |
| 这种毒气不会扩散且容易分辨所以易于躲闪，可是一旦接触到了就会对呼吸道产生严重伤害，若长时间接触还会有生命危险。 |
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| 52. | A poisonous or foul-smelling gas emitted from the earth. |
| 臭气从地里冒出的有毒或恶臭气体 |
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| 53. | a poisonous colorless flammable gas used in organic synthesis and to dope transistors and as a poison |
| 一种无色、有毒的可燃气体，用于有机合成，涂抹晶体管，在战争中用作毒气。 |
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