He practices every day to improve his sailing skills.

We plan to sail on a yacht during the summer vacation.

Studying the history of the Imperial Examination is important for understanding the past of our country.

Maintaining oral hygiene is very important for overall health.

He is working at the pithead.

Sexual intercourse is one of the basic human desires.

They were having sex in secret.

I went to see the beautiful scenery of the Han River.

He is working as a member of the International Criminal Police Organization.

He holds a very high position in that company.