- 穷根究底 qiónggēnjiūdǐ to get to the bottom of thingsto investigate thoroughly; to get to the roots of a problem or the source of a matter
- 穷根探源 qiónggēntànyuán to get to the bottom of thingsto search for the root cause and explore the origin of a matter; to investigate thoroughly
- 穷根问底 qiónggēnwèndǐ get to the bottom of thingsto investigate something thoroughly by inquiring into its root causes and origins
