For example, the central tower will serve as a kind of chimney that keeps air flowing to provide natural ventilation.
例如，塔中心设计成一种烟囱的样式，保证空气流通，用以供给自然通风。
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A handful of salt thrown onto the flames in your fireplace will not only produce pretty, vivid yellow flames, it will help loosen soot in the chimney, preventing chimney fires and improving air flow.