照片中，地月系统实际上看上去像一颗双行星。
In this picture, the Earth-moon system actually appears to be a double planet.
文中推导了拉维娜式行星齿轮变速器的单排双行星轮式齿轮机构的运动特性方程式。
This paper derives the motion property equation of the one-row and two-planets gears for Ravigneaux planetary transmission.
这意味着有两组双行星，而且每组的第一个成员公转3圈的同时另一个星球公转4圈。
That means there are two pairs of planets, and each time the first member of the pair makes three orbits another planet completes four.
介绍了设计大吨位双钩桥式起重机主起升减速器采用双行星轮结构的合理性和可靠性。
The rationality and reliability of main hoist reducer adopted with double spiders structure for large bridge crane are introduced.
详细介绍了主动转向系统的结构和组成，以及核心部件双行星齿轮机构的工作原理及工作模式。
The structure and makeup of active steering system, the operating principle and operating mode of dual planetary gear mechanism are introduced in detail.
特点：双行星搅拌机是一种新型且对多种混合液体、粉体进行搅拌、溶解、分散、均质的高效搅拌设备。
Features: Dual planet mixer is designed for mixing, dissolution, and dispersion different varieties of liquids and powders.
特点：双行星搅拌机是一种新型且对多种混合液体、粉体进行搅拌、溶解、分散、均质的高效搅拌设备。
Features: Dual planet mixer is designed for mixing, dissolution, and dispersion different varieties of liquids and powders.
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