三胚层动物 sānpēicéngdòngwù triploblastic animal Origin Definitions Defs Strokes Stroke Words Sentences Sents 三 sān numeral three the number three; 3胚层 胚層 pēicéng germ layer A layer of cells in an early animal embryo that eventually develops into specific tissues and organs.动物 動物 dòngwù noun animal animal; living creature that can move and has senses