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It should be observed, of course, that no school, vocational or not, is helped by a confusion over its purpose.
It should be observed that,后边是宾语从句，从句是no school is helped by a confusion over its purpose,是个被动语态，翻成主动。翻译：这种现象应该被观察到：没有任何一所学校，不管它是否是技术学院，能从一个不明确的目标中获利。注意help的翻译，根据意思意译出来。