Question

over a period of time是什么意思

Answer 1

over a period of time
过一段时间

例句：
Expect to make friendships gradually, over a period of time, not instantly.
友谊是逐渐形成的，要经过一段时间，不要期望速成；

And over a period of time her grades fell completely.She started having health issues.
而一段时间之后，她的成绩急剧下滑，健康开始有问题。