PREP If something happens during a period of time or an event, it happens continuously, or happens several times between the beginning and end of that period or event. 在…期间内 (不断发生) Sandstorms are common during the Saudi Arabian winter. 在沙特阿拉伯的冬季期间内沙暴很常见。 PREP If something develops during a period of time, it develops gradually from the beginning to the end of that period. 在…期间 (逐步发展) Wages have fallen by more than twenty percent during the past two months. 在过去的两个月期间工资已下降了二十多个百分点。 PREP An event that happens during a period of time happens at some point or moment in that period. 在…期间的某一刻 (发生) During his visit, the Pope will also bless the new hospital. 在他访问期间，教皇也将为新医院祈福。 There will be an opportunity to ask questions during the event.