extend over 详细解释

extend overextend over1.(使)持续, 延续The examinations extend over two weeks.考试持续两个星期。We shall have to extend the payments over an additional period.我们得把付款期再推延一段时间。

例句

1. His researches extended over five years.他的研究持续了5年。 2. to extend over the length and breadth of the country遍及全国