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.
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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