Ballan巴兰balln.球；球状物；炮弹；舞会；愉快的经历；<口>胆量；胡说；（复）睾丸v.使成球状；呈球状；<俚>性交ball joint manipulator球节机械手ball lot mean diameter球批平均直径Ball friction coupling球铰副ball point ink writing圆珠笔字迹Ballantine's voltmeterball joint inclination球节内倾ball mill load testing球磨机负荷检测ball serving technique发球技术Ball valve obstruction球瓣阻滞ball-bearing housing滚珠轴承座