Aluminum remained unknown until the nineteenth century,becau

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Aluminum remained unknown until the nineteenth century,because nowhere in nature is it found free,owing to its always being combined withother elements,most commonly with oxygen,for which it has a strong affinity.
most commonly with oxygen 这句话在整个句子中是属于什么语法,为什么可以单独这么写一下.请英语达人给我解释下吧,请不要贴复制的答案哦,因为我已经看过了,

most commonly with oxygen 是一句【插入语】,相当于对前面一句话的补充说明,不作句子的任何成分.
你可以这样看：
Aluminum remained unknown until the nineteenth century,because nowhere in nature is it found free,owing to its always being combined withother elements【most commonly with oxygen】for which it has a strong affinity.
那个for which 就是直接接在elements 后面的,for which 是解释“它为什么这么稳定”的原因,而most commonly with oxygen 是对elements 前的一句话的补充说明.
翻译：铝元素直到19世纪才为人所知,因为自然界找不到单质铝,这是由于它总是和其他元素结合在一起,通常是和氧元素结合,这就是它有很强的化合能力的原因.
再问：请问这个是插入语的什么句式啊？和with的语法有什么关联吗？
再答：你好：是这样的：在英语的日常用语中，很多地方涉及到 “简写”，你说的with , 其实是 being combined with 这是固定搭配的，如果要完整的将 most commonly with oxygen 还原，那就应该是： owing to its always being combined with other elements, 【its most commonly being combined with oxygen】如果是这样的话，你会发现，前后两句都出现了：its being combined with 显得有点重复，所以就进行简写，most commonly with oxygen 这样就“言简意赅”了

Aluminum remained unknown until the nineteenth century,becau in the early nineteenth century. The book in the nineteenth century. at the mid-nineteenth century 啥意思英语翻译In the nineteenth century,the invention of the telegraph the last half of the nineteenth century ____ the improvement The last half of the nineteenth century __the steady improve 翻译 the last half of nineteenth century wintnessed the steay in the second quarter of the nineteenth century the agriculture revolution in the nineteenth century involve from the late eighteenth to well into the nineteenth century 英语翻译76)The agriculture revolution in the nineteenth century