n.

1. 【解】氣管
2. 【植】導管
3. 螺旋紋管

n.

1. Anatomy  the membranous tube, reinforced by rings of cartilage, conveying air between the larynx and the bronchial tubes; the windpipe.
2. Entomology  an air passage in the body of an insect.
3. Botany  a duct or vessel in a plant.