roller bearing steel

例句：

1. 1.The new rolling bearing steel is much strongerthan the old one.
   新型滚动轴承钢比旧的要强得多。
2. 2. The engineerused roller bearing steel to make the machinemore efficient.
   工程师使用滚动轴承钢使机器更加高效。
3. 3. The manufacturer claims that theirroller bearing steel is of high quality andlong-lasting.
   制造商声称他们的滚动轴承钢质量上乘且耐用。