澳大利亚幅员辽阔，资源丰富，经济科技发达。
Australia has a vast territory, rich in natural resources, economic and technological advanced.
每天有成百万人在这一幅员辽阔的国家中流动，在生气勃勃的经济中寻求机会。
Millions of people are moving across this vast country every day, seeking opportunity in a dynamic economy.
城市轨道交通虽然具有诸多优点，但要使其发挥运输业网络经济的密度效应和幅员效应，我们还有相当长的路要走。
Although urban rail transit has considerable advantages, it still has a long way to go until it exerts density effect and dimensionality effect of the cyber economy.
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