back strap（背带）是什么意思？音标发音+图解场景

背带 /ˈbak ˈdʒʌdʒ/ n

English: back strap · 背带

释义：Reinforced strap that is attached to the back pad; it is fitted with girths that can be attached to the shafts.

这个词出现在以下图解场景（1）