滑阀泵的旋转质量有较大的偏心，如果没有很好的质量平衡，在运转时会产生较大的振动。
There is bigger eccentricity of rotary piston pumps rotary quality, which can produce bigger vibration when it running if no finer quality balance.
滑阀泵的旋转质量有较大的偏心，如果没有很好的质量平衡，在运转时会产生较大的振动。
There has bigger eccentricity of rotary piston pumps rotary quality, which can produce bigger vibration when it running if no finer quality balance.
第一个是一对质量与木星差不多的行星，这对行星步调一致地围绕距离地球15光年的母恒星旋转。
The first is a pair of planets, each about the mass of Jupiter, that whirl around their home star 15 light years from Earth in perfect lockstep.
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