Based on the theory analysis, the reason was discovered of oil- blocking during the operation of a gear oil pump, which resulted in power loss, vibration and noise.

通过分析 ，找出了齿轮油泵在运转过程中造成困油容积而形成功率损失、振动和噪声的原因 ，为设计和维修齿轮油泵提供了消除困油现象的方法和结构措施。

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But the police - in full riot gear - do not agree and are ringing the metal barriers that are blocking off the park.

BBC: Protesters circle NY's Zuccotti Park