Millions of people travel about the country by rail， by bus，orby automobile，ordrive to and from their places of work and their homes。
三个并列的by， by， by作为travel的方式状语。
Millions of people travel about the country by rail， by bus，orby automobile，ordrive to and from their places of work and their homes。
三个并列的by， by， by作为travel的方式状语。
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