音色︰只用空弦拉奏；慢慢地拉奏音阶，一弓维持在 20-30 秒；所有以上半弓或下半弓练习；或对着镜子看（弓的）接触点。

Sound: play open strings alone; play slow scales, sustaining a 20- to 30-second bow; practice everything in the lower or upper half; or watch your contact point in the mirror.

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方法：采用福尔马林固定的头颅标本24具（48侧），首先寻找弓状隆起并磨出上半规管蓝线，进一步测量其与内耳道及相关结构的位置关系。

Methods: The blue line of superior semicircular canal went through the mill and correlative structures were measured on 24 cases of wet cranial bone specimens(48 sides) .

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