常見例句雙語例句Self-aligning ball bearings of the mean diameter range are also available with seals (Figure 1.6) and a for-life grease fill.平均直徑變動的調(diào)心球承也可帶密封(圖1.6)和一個終身油脂填充。blog.sina.com.cn 返回 mean diameter of a ball