In contrast, SBC Communications and BellSouth have adopted a less expensive solution by leaving the copper line in place as a last-mile DSL connection.是什么意思_In contrast, SBC Communications and BellSouth have adopted a less expensive solution by leaving the copper line in place as a last-mile DSL connection.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句