Dual ferrule

• 双金属环

Dual ferrule的用法和样例：

例句

1. A ferrule and eraser are crimped into place on each pencil.
   把金属环和橡皮头固定到每一根铅笔上。
2. The tapered legs, each fitted with a brass ferrule caps the bottom, appear elegant.
   琴脚设计呈锥形，最底下套有黄铜金属环，呈现出尊贵气派。