If you cannot see the vocal cords or epiglottis after positioning the laryngoscope blade, you have probably inserted the blade too far or have not placed the blade precisely in the midline.

• 如果在调整好喉镜窥视片位置后，不能观察到声带或会厌，可能是由于窥视片插入太深或未能将其精确地放置于正中线所致。