数不清的地方运输铁路网络连接起来，密度增加了，旅客的数量也在迅速增长。

The countless networks of tracks operated regionally are being linked, their density increased; the number of passengers is rising rapidly.

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由于这个行业或将面临长期的旅客数量下滑，分析家说在解决旅客的一些担忧方面，各航空公司将面临更大的压力。

As the industry faces what may be a prolonged passenger decline, analysts say companies are under greater pressure to address travelers' concerns.

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在其6%的路线上，运输着全球四分之一数量的旅客。

It carries a quarter of the world's traffic on 6% of its track.

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