yearn和aspire的区别是表达程度、用法的不同。yearn通常指急迫不安地渴望或向往，着重怀有柔情或热情。aspire是热望、有雄心、立志的意思。

例句：She aspired to a scientific career.她有志于科学事业。He aspired to be their next leader.他渴望成为他们的下一届领导人。The people yearned for peace.人民渴望和平。There was a yearning look in his eyes.他两眼流露出渴望的神情。