The idea of a network such as ECN was first considered in the mid 1970s but the concept did not reach fruition until 1992.是什么意思_The idea of a network such as ECN was first considered in the mid 1970s but the concept did not reach fruition until 1992.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句