发贴:流水无声molecule 分子a molecular cell a cellular amino a amino acids (氨基酸) protein 蛋白质 enzyme 酶(proteins that are produced by cells and act as catalysts in specific bioc
过年 celebrate the spring festival 春联 spring festival couplets剪纸 paper-cuts年画 new year paintings买年货 do shopping for the spring festival ; do spring festival shopping敬酒
过年 celebrate the spring festival 春联 spring festival couplets剪纸 paper-cuts年画 new year paintings买年货 do shopping for the spring festival ; do spring festival shopping敬酒