比如，随着人们开始搬离市中心居住，汽车作为交通工具变得更加重要。
For example, as people began moving further away from city centers, cars became important for transportation.
巴士从来不是最时髦的交通工具，但随着一种“超级巴士”的出现，这一局面可能即将改变。
Buses have never been the most glamorous form of transportation.
随着进入美国的交通工具起来越先进，更多的入侵物种坐着轮船、乘着飞机来了，从而更加恶化了对生态系统造成的问题。
However, Cmar says that as transportation into the country has become more advanced, more invasive species have come in on boats and planes, thus worsening the problems posed to ecosystems.
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