HSK 4 · adverb
到底
on earth (in questions); to the end; finally
你到底去不去？
Nǐ dàodǐ qù bú qù?
Are you going or not?
这件事一定要追究到底。
Zhè jiàn shì yídìng yào zhuījiū dàodǐ。
This matter must be investigated to the end.
他决定跟困难斗到底。
Tā juédìng gēn kùnnan dòu dàodǐ。
He decided to fight the difficulties to the end.
归根到底，健康比什么都重要。
Guīgēn-dàodǐ， jiànkāng bǐ shénme dōu zhòngyào。
In the final analysis, health is more important than anything.