诚请各位赐教～小弟不胜感激。。

呃，“中心思想”~~~~
等π~~

魔苟斯把自己力量的一部分注入了阿尔达之中,如同索伦把自己力量的一部分注入了魔戒之中,阿尔达就是魔苟斯的"魔戒";若要杀死魔苟斯彻底毁灭他,就必会导致阿尔达的毁灭。另外《魔苟斯的戒指》又非小说,只是一堆资料**,哪有中心思想一说。

反过来说,只要阿尔达存在一天,邪恶之源头就存在一天,一切的恶与罪就法消弭。

诺多很留恋中土吗?除了像特刚这样迷恋既得或像凯兰崔尔这样不甘平淡的人物,他们对于中土恐怕还是没多少感情,有也是对于多年建设的家乡的不舍情。再者他们来到中土还不是被费诺忽悠来的,为的是报他一家的私仇。

愤怒之战一打完,大批诺多立马走人回阿门。

那我可不可以这么理解？只要中土存在一天，魔苟斯的阴影与力量就一天不会消亡？维拉把魔苟斯逐出黑暗之墙只是暂时限制了他，他的力量还是在牵制和影响着中土？

Melkor 'incarnated' himself (as Morgoth) permanently. He did this so as to control the hroa,the 'flesh' or physical matter, of Arda. He attempted to identify himself with it. A vaster, and more perilous, procedure, though of similar sort to the operations of Sauron with the Rings. Thus, outside the Blessed Realm, all 'matter' was likely to have a 'Melkor ingredient',and those who had bodies, nourished by the hroa of Arda, had as it were a tendency, small or great, towards Melkor: they were none of them wholly free of him in their incarnate form, and their bodies had an effect upon their spirits.
But in this way Morgoth lost (or exchanged, or transmuted) the greater part of his original 'angelic' powers, of mind and spirit, while gaining a terrible grip upon the physical world. For this reason he had to be fought, mainly by physical force, and enormous material ruin was a probable consequence of any direct combat with him, victorious or otherwise. This is the chief explanation of the constant reluctance of the Valar to come into open battle against Morgoth. Manwe's task and problem was much more difficult than Gandalf's. Sauron's, relatively smaller, power was concentrated; Morgoth's vast power was disseminated. The whole of 'Middle-earth' was Morgoth's Ring, though temporarily his attention was mainly upon the North-west. Unless swiftly successful, War against him might well end in reducing all Middle-earth to chaos, possibly even all Arda. It is easy to say: 'It was the task and function of the Elder King to govern Arda and make it possible for the Children of Eru to live in it unmolested.' But the dilemma of the Valar was this: Arda could only be liberated by a physical battle; but a probable result of such a battle was the irretrievable ruin of Arda. Moreover, the final eradication of
Sauron (as a power directing evil) was achievable by the destruction of the Ring. No such eradication of Morgoth was possible, since this required the complete disintegration of the 'matter' of Arda. Sauron's power was not (for example) in gold
as such, but in a particular form or shape made of a particular portion of total gold. Morgoth's power was disseminated throughout Gold, if nowhere absolute (for he did not create Gold) it was nowhere absent. (It was this Morgoth-element in matter, indeed, which was a prerequisite for such 'magic' and other evils as Sauron practised with it and upon it.)
It is quite possible, of course, that certain 'elements' or conditions of matter had attracted Morgoth's special attention(mainly, unless in the remote past, for reasons of his own plans).For example, all gold (in Middle-earth) seems to have had a specially 'evil' trend - but not silver. Water is represented as being almost entirely free of Morgoth. (This, of course, does not mean that any particular sea, stream, river, well, or even vessel of water could not be poisoned or defiled - as all things could.)
上面的选段应该可以解答大多数问题了~

很难说经过末日终战还会有人活到最后。不过死亡也并非坏事,还有第二大乐章和新阿尔达在等待着众生。

既然诺多精灵如此留恋中土，诸如芬国芬等抱憾而死的精灵为何不选择转生？
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他们可以转生，但转生以后必须留在Aman，这是Valar规定的。只有Glorfindel之类的特例可以回到ME

Also during the period of the Exile of the Noldor the Valar had for the time being cut all communications (by physical means) between Aman and Middle-earth.

那句话说的不就是Fingolfin之类的exiled Noldor么
不过说的时候没看原文，汗……确实是有点偏差。
Valar不会允许他们回来，因为 In any case, as far as the Noldor were concerned, these had, as a people, cut themselves off from mercy

我说的那句话是LZ那句话……说的是Noldor = =
其实说白了Valar就是不允许他们离开Aman = = 既然有特例就说明回去在Valar能力以内= =只是Valar通常不愿帮这个忙，除非有充足的理由
难道他们每次都要请示Eru么