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1·During this formative period, graduates are no longer in the home or at the university.

在这段逐渐成形的时期，毕业生不再呆在家里或学校。

2·The interval may be assumed to have been a major formative period in his life: he was 21 years old when it began, 31 when it concluded.

但是这段时间可以被认为是一个人的成形时间(formative period)：开始于他21岁，终止于他31岁那年。