semifocal chord

• 半弦

semifocal chord的用法和样例：

例句

1. He is replacing the broken chord of his violin.
   他正在更换小提琴上那根断了的弦。
2. Most wings have a different chord at different positions along their span.
   大多数机翼在他们跨径的不同位置有着不同翼弦长度。