London has a bigger underground, or metro system.
伦敦的地铁系统要大一些。
Perhaps a new metro system will inspire investors.
或许新的地铁系统可以鼓舞投资者。
Well, I think we need a bigger metro system and more buses here.
哦，我想我们需要一个更发达的地铁系统和更多的公共汽车。
The Boston subway opens as the first underground metro system in North America.
1897年——波士顿地铁——北美第一个地下交通系统——开通。
The Boston subway opens as the first underground metro system in North America.
1897年——波士顿地铁——北美第一个地下交通系统——开通。
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