I don't like studs. You have to make a very widegroove.
我不太喜欢倒勾，因为你必须在指板上挖较宽的沟。
2
Single row deep groove ball bearings are the most common type of rolling bearing and are used in a wide variety of applications.
单列深沟球轴承是球轴承中最普通的种类，应用及其广泛。
3
Deep Groove ball bearings are the most popular of all the ball bearing types because they are available in a wide variety of seal, shield and snap-ring arrangements.