消化器官，胃，中肠，砂囊一种中空的消化器官，尤指某些昆虫的胃或者鸟的砂囊 A hollow digestive organ, especially the stomach of certain insects or the gizzard of a bird.
竹子是中空的。 Bamboo is hollow.
芦笛主干中空的管乐器 A pipe having a hollow stem.
他发现，所有的草地松鼠当被追捕时，首选都是直爬上树，实在没有办法时才选择地洞或中空的木钻。 He discovered that all grassland squirrels made straight for the trees when pursued, and only chose holes in the ground, or hollow logs, as a last resort.
