Shortest path is based on cumulative link costs . link costs are based on the speed of the link 最短的路径是依据累计的连结成本来决定的。连结成本是依据连结速度来决定的。
2.
A study published tuesday in a scientific journal says carbon dioxide concentration in earth ' s atmosphere is rising faster than expected 星期二刊登在一份科学杂志上的报告说，地球大气层中二氧化碳的聚结速度超过预期。
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The article published in " proceedings of the national academy of sciences " cites two factors for the increase , the increasing use of coal by developing countries such as china and india and the decreasing amount of co2 absorbed by the world ' s oceans 刊登在美国国家科学院文献上的文章指出二氧化碳聚结速度加快的两大因素：一是中国和印度等发展中国家的煤炭使用量日益增多，二是地球海洋吸收二氧化碳的能力减弱。
