wing covert（覆羽）是什么意思？音标发音+图解场景

覆羽 /ˈwɪŋ ˈbɒks/ n

English: wing covert · 覆羽

释义：Short feather covering the upper portion of the base of the wing; it maintains internal body temperature.

这个词出现在以下图解场景（1）