The EU has set strict limits on pollution levels.
欧盟对污染程度订下了严格的限制。
The EU has set strict limits on levels of pollution.
欧盟对污染程度作了严格的限制。
The government has set strict limits on levels of pollution of factories.
政府对工厂的污染程度作了严格限制。
The government has set strict limits on levels of pollution of factories.
政府对工厂的污染程度作了严格限制。
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