clay core（黏土心墙）是什么意思？音标发音+图解场景

黏土心墙 /ˈkleɪ ˈkɔː/ n

English: clay core · 黏土心墙

释义：Central portion of the dam that is usually made of compact clay to make it watertight.

这个词出现在以下图解场景（1）