為什麼冰島堪稱為世界上最難學懂的語言？

I'll tell you why (without copying Wikipedia of course!) -
Icelandic, English and Latin are all Indo-European languages. However, Icelandic is a Northern Germanic language; English is a Western Germanic language and Latin is an Italic language. All of them have different grammar and structures.
You mentioned that Icelandic is also 拼音文字 - this is only partly true. A special characteristic for Northern Germanic languages tended to be the way words are pronounced VERY differently to how it's spelt! This is because in Scandinavia there are many dialects in different parts of the land. Take Danish for example, Copenhagen Danish is very different to Jutland Danish and they CANNOT understand each other even if they live in the sam country! Icelandic is the same - in fact, Icelandic is closely related to Norwegian and Faroese - both are again similar to Danish but different enough to a certain extend.
Japanese and Chinese are completely different to European languages in the way it sounds and sentence structures etc. Most Europeans find Chinese hard to learn because there isn't a way to 拼音 in Chinese. For example, I give you the word 'APPLE' in English, you know all the sounds of the letters, so you know how to pronounce this word. If I give this word '國' to Europeans, there is no way they can tell by 拼音 to work out how to say the word!!!
You said Icelandic is '沒有音調' - ok, it sounds very 'flat' compared to English or Italian, but did you know that there are alot of 'th' sounds and glottal stops in Icelandic? That's why it's hard!

冰岛人的祖先是9～10世纪来自挪威西部的移民。由于冰岛远离欧洲大陆，冰岛语始终保持古代挪威语西部方言的特点，词汇很少受外来语的影响。有的语言学家称它为欧洲“最保守的”语言之一。冰岛语曾经吸收丹麦语、凯尔特语、拉丁语和罗曼语族的词语，但19世纪以后，由于纯语主义运动的开展，这些外来词已让位给冰岛语词。科学和工程术语也用冰岛语成分构成。语法上格的变化、名词性的区别、动词结尾的人称变化、音节组合、特别是首音节的组合等，均保留着古斯堪的纳维亚语(即古诺尔斯语)的特点。现代冰岛人仍能阅读1000年前写的古冰岛语史诗。

冰岛语重音总在第一个音节上。它保持着完整的屈折变化系统。动词有人称、时态变化;名词有4个格（主格、生格、与格、受格）；名词、形容词、代词等分阳、阴、中性(其他斯堪的纳维亚语言只分通性和中性),有单、复数之分；定冠词通常作为后缀附着于名词之后。冰岛语的语法和词汇稳定，但现代冰岛语的发音和古代有很大差别。冰岛语采用拉丁文字，但仍然使用古代北欧文字中的字母和 分别表示清、浊齿擦音冰岛有二十万居民说冰岛语。冰岛语是斯堪的纳维亚诸语言中的一种。斯堪的纳维亚诸语言构成日耳曼语族的一支，日耳曼语族属于印欧语系。

2008-07-03 23:54:34 補充：
据介绍,冰岛语是这个世界上最难学的语言之一.它与欧洲的其它语系没有传承关系,所以即使是欧洲人也难以学会.它的发音部位十分古怪,甚至滑稽.我曾看过一个有关天才研究的报道,说普通人可能要在冰岛生活几年才能听懂冰岛语.其中就仔细地介绍了一些冰岛语的特点,确实有够怪的.

http://iask.sina.com.cn/b/3679547.html?from=related

2008-07-03 23:56:42 補充：
冰岛语语法简介
名词三个性，因此定冠词有阴阳中三种，自然也有单复数之分。
定冠词有一种后置用法，就是当限定的名词没有形容词或形容词后置的时候，
定冠词也要后置，并省去统一的开头字母h，用-连接；



动词变位分强弱，强变化有6组和不规则一组，弱变化有4组。
共有14个时态，分现在，过去，将来，现在完成，过去完成，将来完成，虚拟七组
每组内有两种时态
有被动语态，还有中语态，这个就是类似于法语的自反动词

以上内容摘自百度贴吧之冰岛语吧
http://post.baidu.com/f?kw=%B1%F9%B5%BA%D3%EF