了然

shì hòu liǎo rán de shì wù zài dàng shí gēn běn kàn bù qīng

事后了然的事物，在当时根本看不清。

What looks obvious in hindsight was not at all obvious at the time.

yī mù liǎo rán

一目了然

be clear at a glance

tā de hòu dao yuán gōng liǎo rán yú xīn

他的厚道员工了然于心。

His kindness did not go unnoticed by his staff.