rèn shi
我认识他
wǒ rènshi tā
I know him
他不认识这种草药。
Tā bù rènshi zhè zhǒng cǎoyào.
He doesn't recognize this kind of herbal medicine.
认识世界，改造世界。
Rènshi shìjiè, gǎizào shìjiè.
Understand the world, transform the world.