Some people begin to attend certain events or travel to different places so that they can snap that " perfect " photo.

有些人开始参加某些活动或去不同的地方旅行，这样他们就可以拍下“完美”的照片。

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Running external programs upon certain events

特定事件发生时运行外部程序

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Certain events trigger governance vitality activities.

某些事件会触发治理生命力活动。

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The International Olympic Committee restricts low-ranked skiers to certain events.

VOA: standard.2010.01.22

And what this is in a very general sense is the learning of an association between one stimulus and another stimulus, where stimulus is a technical term meaning events in the environment like a certain smell or sound or sight.

一般来说,经典条件作用是指在一个刺激,和另一个刺激之间形成联结，这里的刺激是一个专业术语,意思是环境中出现的事件,比如某种味道，声音或景观。

耶鲁公开课 - 心理学导论课程节选

Use "When" whenever you want to ask about the timing of a certain event or series of events.

当你想要询问一个或一系列事件的具体时间时，你可以用“When”句型。

When 课堂 - SpeakingMax英语口语达人

He said the families' "version of certain events has become 'the truth' even though it isn't".

BBC: Police chief email accuses Hillsborough group of lying

David Crompton said the families' "version of certain events has become 'the truth' even though it isn't".

BBC: Chief Constable David Crompton

Rogge earlier denied fears over pollution, but has now suggested that certain events of more than one hour could be exacerbated by the weather.

BBC: Rogge admits Beijing air concern