构成悲剧的一个主要因素，在于自由意志与必然性之间的关系。
One of the chief elements of tragedy lies in the relation of the free will to necessity.
他们的悲剧结局有其内在动因和历史必然性。
This implies the tragic dynamism and historical inevitability.
第二部分分析人物背景展现悲剧的历史必然性。
And the second part is going to analyze the figures' background to show the historical necessity of the tragedies.
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