For the consumer looking at a frozen tilapia fillet, "the first line of defense is visibility," he says.

消费者选罗非鱼片的时候，“首先是用眼看，”他说。

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The solid modeling of the fillet on the intersection line of two cylinders is a difficult problem in CAD and CAM, all the soft wears have no such function.

圆柱体相贯线上的圆角表示方法是CAD和计算机辅助设计中众所周知的难题。

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