尤其是美国的灾难心理卫生服务水平居于世界前列。
Especially in America, its native disaster psychological healthy service system has been completed and mature.
中国经济高速增长，但我们为此付出了极高的资源环境代价，主要原材料消耗量和污染排放量居于世界前列。
The country's economy has grown rapidly, but we are paying a high price in terms of our resources and environment.
现阶段我国铁路的行车密度已经居于世界前列，行车速度提高的余地又不大，相比之下提高列车重量有着很大的潜力。
It is clear in our county that the traveling density of the railway is very high in the world and it is hard to increase the traveling speed now compared with the huge potentiality of vehicle load.
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