It begins with plastic beads coated with an amine group.The carboxyl group on the first building block forms an amide bond with one of the amines, fixing the building block to a bead.是什么意思_It begins with plastic beads coated with an amine group.The carboxyl group on the first building block forms an amide bond with one of the amines, fixing the building block to a bead.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句