hollow back meaning in English
凹背
脊柱前凸
脊柱下陷
腔背, 穹状书脊(书背和书本身不粘在一起的精装, 各国现在一般均通行这种形式, 日本称之为腔背)
Examples
- The metal - head woods , the featherweight clubs , and the hollow back irons have expanded what is often referred to as the " sweet spot " on the club
镶金属的木质杆头，轻如羽毛的杆子以及背部空心的杆身，都扩大了所谓球杆的甜蜜部位。