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.

After the nuclear accident in Fukushima, decontamination work is being carried out.

They are working hard to decontaminate the radioactive contaminated area.

He became a pariah in society.

This room has high humidity, so we need to use a dehumidifier.

The humidity in this room is high, so let's dehumidify it using a dehumidifier.

This machine is equipped with a high-efficiency heat removal system.