弓弦不能老繃緊了不放,人是軟弱的,如果沒有一點適當的松散,是支持不住的。
http://magimg.hao0517.com/pic/20220330/1648610037830104_761.jpg?watermark/1/image/aHR0cDovL21hZ2ltZy5oYW8wNTE3LmNvbS9waWMvMjAyMDEwMTYvcWlfbml1XzE2MDI4MzM3ODIxMTdfMTE0XzU1Ml81MTgucG5n/dissolve/50/gravity/SouthEast/dx/20/dy/20
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