placode造句

例句与造句

1. Feather growth begins with a thickening of the epidermis called the placode , which elongates into a tube ? the feather germ [ see illustration above ]
   首先，表皮上的基板开始增厚，并拉长成一根管子，称为羽芽（见上方羽毛的成长过程） 。
2. It's difficult to find placode in a sentence. 用placode造句挺难的