| 树 |
shù dòng | tree hollow / (slang) anonymous platform for sharing secrets / (slang) confidant |
| 树 |
shù | tree / CL:棵 / to cultivate / to set up |
| 洞 |
dòng | cave / hole / zero (unambiguous spoken form when spelling out numbers) / CL:个 |
| 洞 |
tóng | used in 洪洞 (the name of a place in Shanxi) |