A trademark law and a patent law have been promulgated and put in force. On June 1,1991,a copyright law went into effect.是什么意思_A trademark law and a patent law have been promulgated and put in force. On June 1,1991,a copyright law went into effect.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句