难句解析：

①When a new movement in art attains a certain fashion, it is advisable to find out whatits advocates are aiming at, for, however farfetched and unreasonable their principlesmay seem today, it is possible that in years to come they may be regarded as normal.

▲该句是一个因果关系的并列句，表示结果的部分是When a new movement in art attains acertain fashion, it is advisable to find out what its advocates are aiming at，表示原因的部分是for it is possible that in years to come they may be regarded as normal。而for与it ispossible that in years to come they may be regarded as normal之间是一个插入语，也是由however+形容词引导的状语从句，意为“不管他们（这群前卫艺术家们）的时尚原则在今天看来多么牵强无理”。

△句中attain原意为“达到”，此处应理解为“发展成”；advocates指倡导的人；however不是“然而”，而是“不论多么”。

②With regard to Futurist poetry, however, the case is rather difficult, for whateverFuturist poetry may be — even admitting that the theory on which it is based may beright — it can hardly be classed as Literature.

▲该句也是一个因果关系的并列句。结果为With regard to Futurist poetry, however, the caseis rather difficult，其中however是插入语，表示此句与上一句之间是转折关系；原因为for之后的部分whatever Futurist poetry may be — even admitting that the theory on which it isbased may be right — it can hardly be classed as Literature，其中破折号之间的部分evenadmitting that the theory on which it is based may be right是插入语，on which it isbased是the theory的定语从句，it指代Futurist poetry。

△注意however一词是对上一句内容的转折信号，了解这一点，the case is rather difficult的意思就不难领会了。同时要抓住作者的态度，他对未来主义诗歌是持完全否定的态度的。

③We must pour out a large stream of essential words, unhampered by stops, orqualifying adjectives, or finite verbs.

▲该句中主句为We must pour out a large stream of essential words，而unhampered bystops, or qualifying adjectives, or finite verbs是过去分词引导的伴随状语。

△注意or连接的qualifying adjectives和finite verbs与stops并列，而不与a large stream ofessential words并列。

④But it is a little upsetting to read in the explanatory notes that a certain line describesa fight between a Turkish and a Bulgarian officer on a bridge off which they both fallinto the river — and then to find that the line consists of the noise of their falling andthe weights of the officers: "Pluff! Pluff! A hundred and eighty-five kilograms."

▲句中开始的it是形式主语，它指代的是to read及后面的定语从句和to find及其后面的宾语从句。that a certain line describes a fight between a Turkish and a Bulgarian officer on abridge off which they both fall into the river是read的宾语从句，其中off which they bothfall into the river是bridge的定语从句；that the line consists of the noise of their fallingand the weights of the officers: "Pluff! Pluff! A hundred and eighty-fivekilograms."是find的宾语从句。

△该句相对较复杂，一定要注意upsetting的意思，它是指当我们先是从注释中得知某诗行讲述了一个场景，便怀着新奇感去读原文，结果却发现原文如此枯燥拙劣，心中不免感到不舒服。

⑤All the same, no thinking man can refuse to accept their first proposition: that a greatchange in our emotional life calls for a change of expression.

▲此处的that从句是proposition的同位语，说明了其内容。

△注意句中的双重否定：no thinking man can refuse to accept their first proposition没有一个有思想的人能否决他们自己最初的主张，也就是“几乎人人都会坚持自己最初的主张”。