Poly(lactic acid) and its copolymers are a potential general green polymer i n 21 century, and their monomer preparation and polymerization methods have beco me an investigative hotspot nowadays.是什么意思_Poly(lactic acid) and its copolymers are a potential general green polymer i n 21 century, and their monomer preparation and polymerization methods have beco me an investigative hotspot nowadays.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句