为了找到带法向量的面元，我就取这两个的叉积。
To find the surface element together with a normal vector, I would just take the cross-product between these guys.
新款as1300双面自动研磨抛光机：适用于不锈钢匙、厨具、叉窝面研磨抛光。
New AS1300 double-face automatic polishing machine: applicable to stainless steel spoon, kitchen utensils, fork nest surface grinding and polishing.
结果：32例单侧三叉神经痛及面肌痉挛的MRTA中，确认患侧有“血管压迫”28例，无血管压迫4例。
Result: Of the unilateral TGX and HFS' s MRTA findings, 28 of 32 cases were confirmed to be the symptomatic side with the vascular compression, except 4 cases.
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