天不知不觉就黑了。
Tiān bùzhī-bùjué jiù hēi le.
English
It got dark before we knew it.
unconsciously
(idiom) unconsciously; unwittingly
Every character draws itself stroke by stroke, then hands you the brush to trace it yourself.
Nice writing!
天不知不觉就黑了。
Tiān bùzhī-bùjué jiù hēi le.
It got dark before we knew it.
他不知不觉睡着了。
Tā bùzhī-bùjué shuì zháo le.
He fell asleep without noticing.
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.