这一切都是无数个因素条件凑合在一起而发生的，没有什么特别，也没有什么奇怪。

All are the countless conditions that come together to make it happen. There is nothing special and strange.

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并讨论了各单因素条件对接枝率的影响变化规律，同时分析了接枝产物的结构及吸湿性能。

Moreover, the effect regularity of every condition on grafting percentage was discussed, and the structure and hydrophilicity of grafted nonwoven were analyzed.

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他指出，只有相对于初始的背景条件，才有可能将特定因素确定为特定历史事件的主要原因。

He points out that it is possible to identify specific factors as the primary causes of a particular historical event only relative to an initial set of background conditions.

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If these are the conditions for contact, to what extent are they met in the university setting between, say blacks and whites, people from the American South versus people from the American North, people from other countries versus people from the United States?

如果大学环境里有这些接触的条件，有多少是属于促成因素的？,例如在黑人和白人之间，来自美国南方的人,和来自美国北方的人之间，外国的学生,和美国的学生之间？

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