@@lunting7307 是拿取潛在技術，君不見洋國撈取留學畢業生，讓他們移民?飽學之士據為己有。To make the situation worse, certain political party /forces push their own good people over to foreign countries.
@@user-fw9zq8cg4u Hi Mr. Chen, 鋼鐵鑄件拆砂模後，需丟在戶外讓日曬雨淋、溫差漲縮、生銹兩年多; 鑄件冷卻, 內部分子成形時排列欠規整（內應力尚在）需時慢慢緩解，兩年後應力褪後可上車床加工成形，不然成品裝配應用半年後或幾個月，定會變形(deform, distort)報廢，尤以應用時發燙部件為甚，如汽車煞車鋼盤、機床axle。We bought some auto brake disks from China (much cheaper) and others from Taiwan, Japan (more expensive), only to discover that cheap ones all warp and customers were unhappy. Other products have no such problems, so (in Canada) we buy only from TW, Japan, Israel and USA.
