When a new movement in art attains a certain fashion, it is advisable to find out what its advocates are aiming at, for, however farfetched and unreasonable their principles may seem today, it is possible that in years to come they may be regarded as normal.
重点单词：advisable明智的，可取的;farfetched牵强的，乱七八糟的
advocate提倡，拥护
语法分析：
①本句的主干是it is advisable to find out… for… it is possible that…，其中it是形式主语，后面的不定式结构to find out what its advocates are aiming at是真正的主语。
②句首的When引导一个时间状语从句，句中的for… it is possible… (至句末)是一个并列分句，表示原因，其中for后面的however +形容词farfetched and unreasonable引导状语从句，表示让步。
参考译文：当艺术上的一项新运动达到一定流行程度时，最好先弄清该运动倡导者的目的，因为，无论他们的创作原则在今天看来多么牵强、多么荒谬，在未来这些理论有可能会被视为正常的东西。
