If we say when a past event happened (for example, by using time-adverbs), we do not usually use the present perfect.
说过去发生的事件(例如：用过去时间状语)，我们通常不用现在完成时。
In biology, we can speak of the life history of an organism since an organism is partially conditioned by past event.
在生物学中，我们能够谈论某种有机体的生活史，因为有机体部分地受过去事件的制约。
The retroactivity of construction of law refers to if the new construction of law can apply to the past event and behaviour.
法律解释的溯及力是指新的法律解释颁布后对其颁布前的事件和行为是否适用的问题。
But the recollection affords a description of the past event, and for most practical purposes it is unnecessary to distinguish between the description and what it describes.
然而回想却提供一种对于过去事件的描述，并且就最实际的目的来说，并没有必要去区别描述与被描述的事物。
But the recollection affords a description of the past event, and for most practical purposes it is unnecessary to distinguish between the description and what it describes.
然而回想却提供一种对于过去事件的描述，并且就最实际的目的来说，并没有必要去区别描述与被描述的事物。
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