As the line 5 subway will open within this year and the Olympic special line and airport line are almost completed, a huge underground transportation network is taking shape.
随著5号线于今年内通车，奥运专线和机场线即将完工，一个庞大的地下交通网已初具规模。
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The Airport Railway stations are different from the underground stations.
机场铁路车站和地铁站不同。
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While this can work successfully at airport checkpoints, he said it is impractical in applications like underground stations because the number of passengers would be too overwhelming to scan.