二者都有“发生”的意思。
happen指事情的发生，往往带有"偶然"的意思。
It happens that I am free today. 恰好今天我没有事。
take place指事先安排或策划好而后发生，没有"偶然"的意思。
下一篇： 区别sometime some time
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2017年最火的网络流行语是这些！[1]
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