- 平行缩减
- parallel shaft reduction gear: 平行轴减速齿轮; 平行轴式减速齿轮
- planetary parallel reduction gear: 行星平行轴减速齿轮箱
- planetary-parallel reduction gear: 行星平行轴减速齿轮箱
- parallel-axes planetary reduction gear: 平行轴行星减速齿轮箱
- be parallel to: 和……平行,和……一样; 平行于; 与...平行, 与...类似
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