He was already buffing the car's hubs.他已经在擦汽车轮毂了。I greased front and rear hubs and adjusted the brakes.我在前后轮毂上都抹了润滑油，还调校了刹车。Shafts and hubs are usually fastened together by means of keys.轴和轮毂通常用键固定在一起....
Searches in the impurity clues in the water - ice dominated plumes and surface ejecta are progressing.科学家持续不断的研究这些由水冰主宰的羽状烟柱及表面喷发物,来寻找水存在的可能性.She plumes herself on the fact that she was educated in Europe.她以在欧洲受教育为荣.And,...