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.

He is said to have a sharp sixth sense.

Recently, I've been troubled by a severe feeling of residual urine.

When I come to this place, I feel a sense of déjà vu for some reason.

The foreign ministry is formulating policies to deal with international issues.