例如，为了保护空气，他们可以骑自行车或步行而不是开车。
For example, to protect the air, they can ride bikes or just walk instead of driving cars.
对于我们城市的每个人来说，从早上6:30到晚上10:30，约有42条公交线路运行。但我们发现25%的人更喜欢骑自行车或步行外出。
As for everyone in our city, there are about 42 bus lines running from 6:30 a. m. to 10:30 p. m. We found that twenty five percent prefer to go outside by bike or on foot.
我们可以骑自行车或步行去上学。
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