你到了现场就后悔了想走，同伴说「来都来了」。这句话在做什么？
You want to leave right after arriving; your companion says 来都来了. This is…?
全球翻车率（内测预估）
A只是单纯陈述你已经到了
zhǐ shì dān chún chén shù nǐ yǐ jīng dào le · just stating that you've arrived
B表示他其实也想走
biǎo shì tā qí shí yě xiǎng zǒu · they want to leave too
C在安慰你不要紧张
zài ān wèi nǐ bú yào jǐn zhāng · reassuring you not to worry
✓用已花的成本把你绑住
yòng yǐ huā de chéng běn bǎ nǐ bǎng zhù · using the cost you've already sunk to keep you there
「来都来了」是中文四大宽容之首。它不讲道理，它讲的是你已经花掉的路费。
来都来了 (“you're already here”) is China's most famous sunk-cost argument. It doesn't reason with you; it bills you for the trip you already paid for.