It is virtually vibration free and very quiet.
几乎是不可能的振动自由和非常安静。
Therefore our oil-lubricated vacuum pumps are especially quiet running and almost vibration-free.
因此，我们的油润真空泵运行时特别安静，几乎无振动。
Therefore our oil-lubricated vacuum pumps are especially quiet running and almost vibration-free.
因此，我们的油润真空泵运行时特别安静，几乎无振动。
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