Thrust ball bearings, ring and the shaft with them.
双向推力球轴承，其中圈与轴配合。
Four point contract center-oriented thrust ball bearing.
四点接触向心推力轴承。
Thrust ball bearings can bear radial load, lower speed limit.
推力球轴承不能承受径向负荷，极限转速较低。
The double direction Thrust ball bearings can support bi-directional loads.
在双向推力球轴承可以承受双向的负载。
Single thrust ball bearing can be subject to the axial load from single direction.
单向推力球轴承可承受单一方向的轴向载荷。
Suddenly the door was opened and a ball was thrust in.
突然门开了，有人扔进了一个球。
Suddenly the door was opened and a ball was thrust in.
突然门开了，有人扔进了一个球。
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