因此，它省去了电机的轴承、密封。

Therefore, it tell the motor bearings, seal.

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前后端盖装有永久密封和自润滑的滚珠轴承。

Permanently sealed and lubricated ball bearings front and rear.

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前后端盖装有永久密封和自润滑的滚珠轴承。

Permanently sealed and lubricated ball bearings front and rear.

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