叶弦，汉语词汇，叶片翼型横截面上前沿和后沿相连的参考直线长度（叶弦片）按一定的惯例定义。
Z - 9b型特点是一个改进11浆叶涵道尾桨，减阻内置螺旋浆采用宽弦、全-复合浆叶而不是像在AS 365n1型中的13片全-金属浆叶。
The Z-9B variant features a modified 11-blade Fenestron faired-in tail rotor with wider-chord, all-composite blades instead of 13 all-metal blades as in as 365n1.
如同Z - 9b, Z - 9c也具有的特征是一个改进11浆叶涵道减阻内置尾螺旋浆，采用宽弦全复合浆叶而不是像AD 365n1型一样的13片全-金属浆叶。
Like the Z-9B, the Z-9C also features a modified 11-blade Fenestron faired-in tail rotor with wider-chord, all-composite blades instead of 13 all-metal blades as in as 365n1.
在二十世纪上半叶关门倒闭后至今，只有素心一家做出了接近明代丝弦品质的蚕丝冰弦。
From the closure of companies in the first half of the twentieth century until now, only Suxin Silk strings has produced strings of a quality that comes close to Ming dynasty ice strings.
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