The entrepreneurs laid the first tunnels, operated the first lines, and showed that it was a profitable enterprise.
企业家们开掘了第一条隧道，运行了第一条地铁线路，并且显示这是有利可图的。
The entrepreneurs laid the first tunnels, operated the first lines, and showed that it was a profitable enterprise.
企业家们开掘了第一条隧道，运行了第一条地铁线路，并且显示这是有利可图的。
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