Growing levelsof pollution represent a serious health hazard to the local population.
日益严重的污染对当地人民的健康构成了重大威胁。
《牛津词典》
2
The polio drive has demonstrated that it is possible to achieve very high rates ofpopulation coverage despite weak health infrastructures and high levelsof poverty.
脊灰运动表明,尽管存在薄弱的卫生基础设施和高水平的贫穷,也有可能实现很高的人口覆盖率。
3
He notes that New Orleans is almost back to its pre-Katrina populationlevels, and reckons that some of those arrivals are people excited by the state's potential.