the third body 第三体
third body wear 第三体磨损
third-body perturbation 第三体引力
The third body attraction perturbation 第三体引力摄动
the third state of body 身体第三种状态
Burn of third degree, body region unspecified 三度烧伤,身体部位未特指
the third-generation central governing body 第三代中央领导集体
Corrosion of third degree, body region unspecified 三度腐蚀伤,身体部位未特指
All of those period oscillations show that the two system both possess a third body.
这两个系统所存在的周期性振荡，表明它们都存在第三天体。
参考来源 - 银河星团中过相接双星的观测与研究The continuous and compact third body which is formed under the high speed friction can make the friction coefficient stable.
原因在于随转速增加,试样表面第三体致密性增加,起到稳定摩擦系数的作用。
参考来源 - 摩擦条件对制动闸片摩擦磨损性能的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
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