This road is very flat and easy to walk on.

This table is completely flat.

He is a perfectionist, and his approach to work is very strict.

This programming language is said to be Turing complete.

His performance was perfect and without blemish.

In mathematics, a perfect number refers to a number where the sum of its divisors, excluding the number itself, equals the number.

He is immersed in the study of panmagic squares.

This fish is completely farmed, and no capture is done in the natural environment.

I am planning to go to Pyongyang next week.

In Korean, a flat sound is an unaspirated sound.