英语长句分析与翻译

这是一个长难句

each flow channel is defined by a plurality of channel walls of the intersecting walls with at least two of the plurality of channel walls including concave inner surfaces facing a center of the corresponding flow channel from central portions of the concave inner surfaces to concave corner portions facing the center of the corresponding flow channel.

麻烦老师看下句子结构，实在无从下手，不知道怎么翻译。