为了使骑自行车更安全，一些住得和工作地点很近的人一起骑车上班，他们称之为“自行车火车”。
To make bicycling safer, some people who live and work near each other are riding to work together, which they call a "bike train".
这次有趣的活动是为了刺激开车的人注意行车安全。
The funny campaign sets out to shock people into driving more carefully.
为了保证安全，你可以在人行道上等待同时当心汽车和自行车。
To keep safe, you can wait on the pavemant and look out for cars and bikes.
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