For example, to protect the air, they can ride bikes or just walk instead of driving cars.
例如，为了保护空气，他们可以骑自行车或步行而不是开车。
Walk short distances instead of asking for a ride in a car.
短距离的路途，用步行代替坐车。
To help with the environment, I always walk or ride a bike to school instead of taking a car.
帮助环境，我总是步行或骑自行车去学校代替汽车。
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