A copy of the Bellcore specification can be made available if you are interested. This Standard has been in effect for over 20 years with excellent results.是什么意思_A copy of the Bellcore specification can be made available if you are interested. This Standard has been in effect for over 20 years with excellent results.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句