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1. The vacuum oil in the machine is very important for its operation.
机器中的真空泵油对其运行至关重要。
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2. The vacuum oil in the machine needs to be replaced regularly to ensure its longevity.
机器中的真空泵油需要定期更换，以延长其使用寿命。
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3. The vacuum oil in the machine helps to reduce friction and improve efficiency.
机器中的真空泵油有助于减少摩擦，提高效率。