mesohyl（中胶层）是什么意思？音标发音+图解场景

中胶层 /ˈmɛnz ˈsuːts/ n

English: mesohyl · 中胶层

释义：Gelatinous substance, rich in water, located between the ectoderm and the endoderm.

这个词出现在以下图解场景（1）