最近十几年来，银河系已被确认为是一个棒旋星系，而不是无棒结构的普通旋涡星系。

Therefore, our Milky Way should be morphologically catalogued as a barred spiral galaxy instead of a normal spiral one.

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旋涡气泵结构紧凑，体积小，重量轻，不需变速装置，除轴承外其它部位没有直接接触磨擦，噪音低，送出的气源无水无油。

Swirl pump is compact, light weighted and no speed-adjusting device needed, no friction except bearer, low noise, no water and no oil in the output air.

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