He is completely ignorant about politics.

He was able to acknowledge his ignorance.

He whipped the horse.

This bacteria moves using its flagellum.

This shrine has been enshrining the local deity, referred to as 'Ki', since ancient times.

He admitted his ignorance.

It is said that ignorance is the mother of happiness.

He hit the ball.

This bacterium moves using a flagellum.

I love kimchi.