Mothers all want their sons to grow up to be president,but t

Mothers all want their sons to grow up to be president,but they don't want them to become politicians in the
process.-----John Kennedy
翻译完是：
母亲们都想要他们的儿子长大当总统,但不想他们在此过程中成为政治家.----约翰.肯尼迪
这句话有什么深刻含义么?