人吃五谷杂粮生百病,人生病了会有症状,会找医生看病。那么,看似坚硬的金属会“生病”吗?外表光滑致密,可里面却有细小的裂纹,合金材质却少了一些标注的金属成分,貌似严丝合缝的焊口却有极小的孔眼……这些都是金属生的“病”。 People eat whole grains and cereals, sick people will have symptoms, will find a doctor to see a doctor. Then, the seemingly hard metal will be “sick”? Appearance is smooth and dense, but there are small cracks inside, but the alloy material is less some of the metal components of the mark, seemingly seam weld has minimal perforation ... These are all metal “sick”.