问题描述：
OBAMA这个话怎么理解?
For they have forgotten what this country has already done; what free men and women can achieve when imagination is joined to common purpose,and necessity to courage.
其中necessity to courage 是跟在哪的?For they have forgotten what this country has already done and necessity to courage.
他们忘了这个国家已经做到的和勇气的必要性.
还是跟在Purpose后的?
For they have forgotten what this country has already done; what free men and women can achieve when imagination is joined to common purpose,and necessity to courage.
其中necessity to courage 是跟在哪的?For they have forgotten what this country has already done and necessity to courage.
他们忘了这个国家已经做到的和勇气的必要性.
还是跟在Purpose后的?
问题解答：
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