sliding jaw（滑动卡爪）是什么意思？音标发音+图解场景

滑动卡爪 /ˈslaɪdɪŋ ˈdʒɔː/ n

English: sliding jaw · 滑动卡爪

释义：Tapered part attached to the end of the vernier that slides along the ruler to the object to be measured.

这个词出现在以下图解场景（1）