one swallow doesn't make a summer .能否解释一下为什么燕子前加one,夏天前加a.那summer前不加冠词可以吗？

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• one swallow doesn't make a summer .能否解释一下为什么燕子前加one,夏天前加a.那summer前不加冠词可以吗？
• one swallow doesn't make a summer .能否解释一下为什么燕子前加one,夏天前加a.
• 英语翻译原题是One swallow can not make a summer Look before you leap A fall into a pit a gain in your wit
• one swallow doesn't make a summer是一个谚语。