چیزی که به تدریج اتفاق می افته یا یک دوره زمانی قابل توجه رو شامل میشه
over a period of time" is correct and usable in written English.
You can use it to describe a process that happens gradually and/or spans a significant amount of time. For example: "She has been learning Spanish for several years, and her progress has been remarkable over a period of time. ".
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