Understanding dynamical systems is an important part of physics.

The Japanese imperial family line is said to have the longest history in the world.

She often reads books on spirituality.

She is deeply devoted to the New Age spirituality.

He loves 'Narou-kei' novels and reads them every day.

He is good at playing the harmonica.

He is a very talkative person, always continuing to talk.

He gave her a kiss.

I have been to Haikou.

He kissed her hand in an archaic manner.