小林同学一直认为不锈钢是一种耐腐蚀的材料,无论怎样都不会生锈。但他最近却发现一个奇怪的现象:家中一些不锈钢材料制成的家具,使用一段时间后也会生锈,特别是在卫生间、厨房等容易接触水分的地方更是如此。对此他百思不得其解,为什么 Kobayashi has always believed that stainless steel is a corrosion-resistant material that will not rust anyway. However, he recently discovered a strange phenomenon: Some furniture made of stainless steel in the home will rust after being used for a period of time, especially in places such as toilets and kitchens that are prone to contact with water. Why is he puzzled about this? Why