downstream shoulder（下游坝肩）是什么意思？音标发音+图解场景

下游坝肩 /ˈdaʊnstɹiːm ˈfeɪs/ n

English: downstream shoulder · 下游坝肩

释义：Soil embankment that, together with the upstream shoulder, provides stability to the structure.

这个词出现在以下图解场景（1）