听到前门砰地一声关上，我才放下了心。

I was relieved to hear the front door slam.

《柯林斯英汉双解大词典》

她一定晓得我已经离开了巴黎，因此她对我们关系破裂之后会发生些什么后果放下了心。

In all likelihood, she had got to hear of my departure which had set her mind at rest as to the consequences of our sudden parting.

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