n. (Anat.) One of the incomplete rings of the upper part of the bronchial tubes of most birds. The semirings form an essential part of the syrinx, or musical organ, of singing birds. [ 1913 Webster ]
[临渊羡鱼不如退而结网 / 臨淵羨魚不如退而結網, lín yuān xiàn yú bù rú tuì ér jié wǎngㄌㄧㄣˊ ㄩㄢ ㄒㄧㄢˋ ㄩˊ ㄅㄨˋ ㄖㄨˊ ㄊㄨㄟˋ ㄦˊ ㄐㄧㄝˊ ㄨㄤˇ] rather than admiring fish, go home and weave a net