we must take some measures to prevent the environment being poll. 改为被动.速度,急.考试中.

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wemusttakesomemeasurestopreventtheenvironmentbeingpoll.改为被动.速度,急.考试中.wemusttakesomemeasurestoprevent

we must take some measures to prevent the environment being poll. 改为被动.速度,急.考试中.
we must take some measures to prevent the environment being poll. 改为被动.速度,急.考试中.

we must take some measures to prevent the environment being poll. 改为被动.速度,急.考试中.
Some measures must be taken to prevent the environment being poll.