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。
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。
We can also walk or ride bicycles to school or work instead of car, to reduce carbon dioxide emissions.
我们还可以步行或骑自行车上学或上班代替坐车，减少二氧化碳排放。
We'd better walk or ride bikes to work or go to school instead of driving a car, We mustn't use plastic bags.
我们最好步行或骑自行车上班或上学而不是开车，我们不应该使用塑料袋。
We'd better walk or ride bikes to work or go to school instead of driving a car, We mustn't use plastic bags.
我们最好步行或骑自行车上班或上学而不是开车，我们不应该使用塑料袋。
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