一次又一次。
Over the past year, our late-night news program has devoted increased time to national news and less time to weather and local news.
过去一年里,我们的深夜新闻节目增加了全国新闻的播放时间,减少天气预报和地方新闻的播放时间。
The need to run the railways on time meant that local time was abolished and clocks showed the same time all over the country.
准时运行铁路的需求意味着废除地方时间,统一全国各地的时间。
Readers can better understand how informed consent and the question of morality in medical experiments have changed over time.
VOA: special.2010.07.21
So when we talk about a cohort study, this means taking a group of people and following them over time.
所以当我们提到定群研究,就意味着,有一群人参加实验并需一直追踪下去
or if it's over a long period of time and it's an ongoing situation that you want to get rid of.
或者是一件持续了很久的事,你特别想摆脱它。
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