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1.The ventilation tower is designed to improve indoor air quality.
通风塔旨在改善室内空气质量。
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2.The construction of the ventilation tower has been completed.
通风塔的建造已经完成。
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3. The ventilation tower plays an important role in maintaining a healthy living environment.
通风塔在维护健康生活环境中起着重要作用。