(used with expressions for periods of time) during :
He's seen many changes in the course of his long life.
The company faces major challenges over the course of the next few years.
(used with expressions for periods of time) during :
He's seen many changes in the course of his long life.
The company faces major challenges over the course of the next few years.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005