double ball bearing造句

The heavier duty versions had thicker metal bodies, double ball bearing races in each axlebox and usually a central stiffening girder.
A critical requirement for accuracy is low static friction ( stiction ) in the bearings of the pendulum; this is achieved by various means ranging from double ball bearing with a superimposed oscillatory motion to dither the bearing above its threshold or through the use of gaseous or fluid bearings or by the alternative method of floating the gyroscope in a fluid and restraining the residual mass by jewel bearings or electromagnetic means.
It's difficult to find double ball bearing in a sentence. 用double ball bearing造句挺难的