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 one of these days 

At some unspecified date in the future; someday; eventually.

將來有一天，過不了多久

You're going to get into serious trouble one of these days. 

將來有一天你會惹上大麻煩。

One of these days, someone is going to steal your purse if you don't take better care of it.

如果你不好好保管你的錢包，過不了多久就會有人偷走它。