And for a special case that there is a redundant route reflector within each cluster, the solvability conditions for the problem are given and it is shown that the problem in general is NP-hard.是什么意思_And for a special case that there is a redundant route reflector within each cluster, the solvability conditions for the problem are given and it is shown that the problem in general is NP-hard.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句