The innerring of buildings once housed classrooms. Now children go outside for school.
最里面的一圈以前是学校,现在孩子们都到外面上学。
2
For needle roller bearings without innerring, a suitable internal clearance is achieved by selecting the appropriate tolerance for the raceway diameter.
对于无内圈滚针轴承,通过为滚道直径选择合适的公差,可得到合适的内部游隙。
3
These bearings have no central rib on the innerring and are therefore able to use longer barrel rollers.