It is necessary to be a scientist to make a differenceto be a scientist 和 to make a difference在此句中分别充当什么成分?sorry,可能是我打错了，原句应该是It is not necessary to be a scientist to make a difference.句中重点应该是侧重于表达要取得
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to be a scientist 和 to make a difference可以认为都是真正主语
还可以认为to be a scientist 是真正主语,to make a difference作状语.
======以下答案可供参考======
供参考答案1:
楼上说的很对!