rein ring（缰绳环）是什么意思？音标发音+图解场景

缰绳环 /ˈɹiːl ˈpleɪt/ n

English: rein ring · 缰绳环

释义：Round part that is attached to the end of the lower cheek; the curb rein is attached to it.

这个词出现在以下图解场景（1）