由于氮占我们呼吸的空气的五分之四，他们对提高火星的温度持惊人的乐观态度，相信这可以在一百年内完成。
Since nitrogen is four fifths of the air we breathe, they are surprisingly optimistic about raising the temperature on Mars and believe it could be done in hundred years.
这些中东人是持长期商业护照过来的；他们来这里大宗采购便宜的衣服和五金器具，大多数又飞回迪拜，巴格达或者德黑兰，然后半年后再回来做生意。
The Middle Easterners come on long-term business visas; after buying cheap clothes and hardware in bulk, most jet to Dubai, Baghdad or Tehran before returning for another six months of trade.
他只持一把短剑就赶跑了五名来犯者。
Arming only with a short sword, he drove off five of his attackers.
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