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1·Poisonous gas closed in on the town.

毒气渐渐笼罩了这个小镇。

2·The old well was filled with poisonous gas.

那口古井里充满毒气。

3·If (it is) burnt, rubber can give off a poisonous gas.

橡胶如果燃烧起来，会发出有毒气体。

4·Each place gave out poisonous gas that made people faint.

各地都冒着令人昏眩的毒瓦斯。

5·The accidental discharge of the poisonous gas caused some chaos.

有毒气体的排放造成了一些混乱的意外。

6·But they also produced what was in their world a poisonous gas-oxygen.

但他们同时也制造了在当时是毒气的气体——氧气。

7·Many factories allow poisonous gas and smoke to escape into the air.

很多工厂都让毒气和毒烟排放到空气里。

8·But, unlike any other geyser, this one erupted with a poisonous gas.

但是，这个间歇泉不像其它间歇泉，它喷发的时候毒气也一起冲起来。

9·Some factories send waste water into river and poisonous gas into the air.

一些工厂往河里排放污水或有毒气体。

10·But moreover can not filter of poisonous gas, but be not the ancients can make of.

而另外不能过滤的毒气，却不是古人所能制造的了。