thread take-up lever（挑线杆）是什么意思？音标发音+图解场景

挑线杆 /ˈθɹɛd ˈɡaɪd/ n

English: thread take-up lever · 挑线杆

释义：Lever that the upper thread goes through before it is threaded through the needle; it regulates tension.

这个词出现在以下图解场景（1）