He likes to take a walk in the park at dusk.

Linear programming is a part of operations research and is used to find the optimal solution.

Paying the urban planning tax is a citizen's duty.

The United Nations Environment Programme is providing solutions to global environmental problems.

In female anatomy, the labia majora is a part of the external genitalia.

He is studying the penile bone of ancient animals.

The 大陰脣 is a part of the female reproductive system.

She underwent an episiotomy for childbirth.

We should always remember the power of Kannon in difficult times.

The clitoral glans is a part of the female genitalia and is very sensitive to sexual stimulation.