Meaning of jiū jìng:
究竟
to go to the bottom of a matter; after all; when all is said and done; (in an interrogative sentence) finally; result
Wǒmen xūyào nòng qīngchǔ shìqíng de jiūjìng.
我们需要弄清楚事情的究竟。
We need to get to the bottom of the matter.
Tā jiūjìng shì shéi?
他究竟是谁?
Who is he after all?
Wǒmen bù zhīdào tā jiūjìng qù nǎlǐ le.
我们不知道他究竟去哪里了。
We don't know where on earth he went.
Nǐ jiūjìng xiǎng yào shénme?
你究竟想要什么?
What do you actually want?
Nǐ xiǎng zhīdào shìqíng de jiūjìng ma?
你想知道事情的究竟吗?
Do you want to know the result of the matter?
outcome
Wǒmen hái bù zhīdào shìqíng de jiūjìng.
我们还不知道事情的究竟。
We still don't know the outcome of the matter.