It was pointed out that the key factor that restrict the development of PEN was the production of its intermediate 2,6-naphthalene dicarboxylic acid(...是什么意思_It was pointed out that the key factor that restrict the development of PEN was the production of its intermediate 2,6-naphthalene dicarboxylic acid(...在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句