noun · the chief or head of an organization, especially an underworld gang

他是这个帮派的龙头老大。

noun · a device for controlling the flow of liquid from a pipe

洗手间里的龙头坏了，一直在滴水。

noun · the decorative dragon head located on the prow of a dragon boat

龙舟的龙头雕刻得非常精美。

noun · the steering bar of a bicycle or similar vehicle

他紧紧握住自行车的龙头，以免摔倒。

noun · a leading or dominant company or entity in a specific industry or field

这家公司是全球半导体行业的龙头。