“roller-blading"是什么溜冰鞋?

“roller-blading是什么溜冰鞋? roller--blading的中文意思是什么? free ink roller是什么 roller ROLLER Spherical Roller Bearing是什么轴承? bridge roller bearings是什么轴承? roller blade的现在进行式是什么? 英语翻译Nick is alovely boy,he likes sports very much.He can roller blade and ride a horse,but he can't ski and play the piano.Mark is Nick's brother,his favourite sports are playing the piano and roller blading,he doesn't like riding a horse and bush roller roller towel roller cart bail roller Upper roller lower roller是什么意思 spherical roller bearings 239/630 CAK/W33 请问这是什么轴承 机械中roller 和 shaft 具体区别是什么?可以清楚解释一下吗!谢谢! roller skate & roller blade有什么区别? 过去时：spill fell crash lift need paint roller-blade burn请问这些词的过去时是什么,意思是什么