英语翻译The formal characteristics of a subject of historical en

英语翻译
The formal characteristics of a subject of historical enquiry can be set out briefly as follows:
1.It is a situation in the past which has not survived,assignable in terms of place and time:place and time being,not so much "there" and "then",as a context of other related occurrences or situations.
2.This situation is recognized not merely to have occured,but to be itself an outcome or an event.It is to be understood in terms of changes which mediated its eventuality and composed its historical character.
请人工翻译