底节最长三寸三分,最短三寸二分,过长音空,过短音窄,西皮适合较短的底节,二簧适合较长的底节。超过三寸三分太多音发闷,太短音薄不厚实。风口长八分至八分半,宽一分半不足,内腔粗的风口可大些。最宽一分八(图21)。底节内空三寸三分,堵头三分,内空三寸。底节的长短超过或不足一分左右都可用,用堵头的长短来调节(图22)。 The longest three-inch section of the bottom three inches, the shortest three-inch dichotomy, too long sound, too short tone, the West for a shorter section of the bottom, the second spring for a longer section. More than three-inch one-third too much hair bored, too thin and not thick. The tuyere long eight minutes to eight and a half, wide and a half less than the coarse lumen can be larger. The widest one eight (Figure 21). Minute three inches inside the bottom section, the plug one-third, within three inches. The length of the base section is over or under a minute and is adjustable by the length of the plug (Figure 22).