Volunteering is not a substitute for paid work. Volunteering is no substitute for paid work. I think that they both mean the same thing. Volunteering is not a suitable alternative for paid work..

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I think the meanings are very close and subject to interpretation. "Volunteering is not a substitute for work" sounds a bit more neutral in tone -- more of a factual assertion. "Volunteering is no substitute for work" sounds more opinionated and emphatic. It implies that volunteering is inferior to paid work in some form or fashion. The context of the statement would be important to give a clue as to what the speaker meant.

An interpretation: A You should be doing your paid work, not volunteering. B Volunteering is not a suitable alternative to paid work.

虽然两者都包含一样的意思，可是“Volunteering is no substitute for paid work”这个句字的“is no”更加直言不讳的色彩。实际上，”is no”是“is not a”一样的意思。例如，在英语里面可以说： “That was not an accident.”或是“That was no accident.” 一样的意思，只是后者是比较直言不讳的~~~ 另外一个例子：如果在半夜里你跟一个朋友听到一个非常陌生的声音，你们可能会感到害怕和吃惊。第一个人可能会可怕地说：“It was a cat.” 可是第二个人完全不赞同，说：“That was no cat!”