noun · a hollow cylindrical object used for conveying fluids, gases, or protecting cables; a pipe

这些地下的管子是用来排水的。

proper name, noun · Guan Zhong (c. 720–645 BC), a famous politician and philosopher of the State of Qi during the Spring and Autumn period.

我们老师经常在课上提到管子的思想。

proper name · A classical Chinese book containing writings attributed to Guan Zhong and his school of thought.

我最近正在研读《管子》这本书。

noun · a small, thin tube used for sucking up a drink

请给我一根管子喝可乐。