1Aluminum remained unknown until the nineteenth century, because nowhere in nature is it found free, owing to its always being combined with other elements, most commonly with oxygen, for which it has a strong affinity.
1Aluminum remained unknown until the nineteenth century, because nowhere in nature is it found free, owing to its always being combined with other elements, most commonly with oxygen, for which it has a strong affinity.
直到19世纪,铝才被人们发现,因为在自然界中纯净的铝并不存在,它总是与其他物质相结合,尤其常见的是和氧气结合形成相当稳定的混合物.