动词包，抱( infold的现在分词 )
1. 内折：influx 流注 河流汇合处 内流 汇集 | infolding 内折 | infoquote 参考报价
noun
1. infolding的解释
1. the folding in of an outer layer so as to form a pocket in the surface
e.g. the invagination of the blastula
Synonym: invagination introversion intussusception