求翻译：前431年，斯巴达的同盟底比斯进攻雅典的同盟普拉提，正式引发了伯罗奔尼撒战争。雅典依靠其强大的海军进行封锁，斯巴达则攻入雅典，试图迫其决战。双方互有胜负，但都未能取得决定性胜利，遂于前421年缔结和约。和平未能维持很久，前415年，雅典对西西里岛斯巴达的盟邦叙拉古发动大规模远征，结果以惨败告终。西西里远征使雅典元气大伤，无力抵御斯巴达的攻势。前405年，雅典海军被全歼。次年，雅典向斯巴达投降，斯巴达成了希腊的新霸主。斯巴达的霸权也未能长久，希腊各城邦陷入混战之中。是什么意思？

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The 431 years, up to the Alliance, the Alliance attack Athens Pilates, formally the Peloponnesian War. Athens relies on its powerful navy to blockade, Sparta, Athens is tapping into the attempt to force the decisive battle. Both sides win, but have not been able to achieve a decisive victory, the fo

431 BC, Spartan alliance allies attack Thebes Athens Pilates, triggered the Peloponnesian War. Relying on their powerful Navy to blockade of Athens, Sparta into Athens, trying to force it a decisive battle. Both sides are winning or losing, but failed to win a decisive victory, was concluded in 421