Tripoli, home to about a third of Libya's population of 6 million, is the center of the eroding territory that Gadhafi still controls.
的黎波里拥有三分之一的利比亚人口，目前依然是卡扎菲掌控的中心。
2
According to Liu, the populationcontrols have kept sulphur dioxide emissions down by 17.6% and the main source of water pollution by 30.8%.
刘少杰称，人口控制已经将二氧化硫的排放量降低了17.6%，水污染的主要来源减少了30.8%。
3
And statistical controls are unlikely to compensate for a poor sampling strategy that does not yield a sample representative of the population to which we want to generalize.