neck ring

基本解释

The cylinder neck ring displays the name of the current owner of the cylinder.
颈环显示着钢瓶现在的所有者的名字。
A threaded neck ring is secured to the tapered end of the cylinder to allow a protective cylinder cap to be installed.
车有螺纹的颈环固定在钢瓶的锥形端，可以安装保护性瓶帽。
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A neck ring or ear loop can be plugged into a headphone jack on an audio source and provide direct inductive coupling between the audio source and a special induction coil on a person's hearing aid.
项圈或耳环可以插入到音讯源上的耳机接孔里，提供音讯源与听觉辅助设备上的特殊电感线圈之间直接的电感耦合。