以下为句子列表：
英文: Any special requirements such as Gear operation, Motor operation, Hydraulic or Pneumatic Cylinder operation, Anti-friction bearing yoke sleeve, By-Pass of drain, etc. must also be specified on purchase orders.
中文: 如果有特殊要求，如齿轮操作机构，马达执行机构，液动或气动缸体执行机构，耐摩擦轴承轭架套管，排泄旁路，等等，在订购时都必须特别注明。
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