Over a period of time的用法和樣例：
例句
- An increase in the incidence of oxacillin-resistant S. aureus oer time was obsered.
並且經過一段時間的觀察發現耐苯唑西林的金葡菌的比例有所增加。 - The clean wool is then spun by hand.The wool is loosely dipped into dyeing vats and left for a time that could be judged only by the expert craftsman.
漂染的過程是在染桶里進行的，將稀鬆的毛線放在染桶里保持一段時間，而只有專業的工匠才能把握好這段時間的長短。
