drill pipe（钻杆）是什么意思？音标发音+图解场景

钻杆 /ˈdɹɪl ˈkɒlə/ n

English: drill pipe · 钻杆

释义：Hollow steel rods that are joined together according to the depth of the excavation; their rotation activates the bit.

这个词出现在以下图解场景（1）