为了在工件上加工光滑的轮廓，帕森提出了一种自动的机床控制方式，它能够引导铣床刀具加工出一种“过轴曲线”。
Parsons recommended a method of automatic machine control that would guide a milling cutter to produce a "thru-axis curve" in order to generate smooth profiles on work pieces.
现有塑料光滑螺旋扭带不能用于低流速传热设备的自动清洗。
The smooth plastic strip can not apply to auto-cleanout of low velocity of flow in heat exchanger in existence.
塑料光滑扭带具有自动清洗和传热强化的双重功能，结构又很简单，但传热强化功能不强。
Smooth twisting belt made of plastics is simple in structure and pocesses the double functions of self-cleaning and heat transfer , but heat transfer is not large enough.
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