There is no easy answer to a problem that has built up over decades, of course.
当然，要解决这个已延续几十年的问题绝非易事。
He often has a special plan or answer to a problem that he can use if he needs it.
他常常对问题有特殊的方案或解决方法，在需要时用得上。
He often has a special plan or answer to a problem that he can use if he needs it.
他常常对问题有特殊的方案或解决方法，在需要时用得上。
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