1N-COUNT 肠 Your bowels are the tubes in your body through which digested food passes from your stomach to your anus. 肠
2N-PLURAL 大便 You can refer in a polite way to someone getting rid of the waste from their body by saying that they move, open, or empty their bowels . 大便
3N-PLURAL 内部;深处 You can refer to the parts deep inside something such as the earth, a building, or a machine as the bowels of that thing. 内部;深处 [humorous, or literary]
...deep in the bowels of the earth.
在地心深处
Lyn went off into the dark bowels of the building.