Unexpectedly, his face came to mind.

A mass noun refers to a noun that cannot be counted.

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

This programming language is said to be Turing complete.

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

His performance was perfect and without blemish.

He is immersed in the study of panmagic squares.

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

Information retrieval technology is essential for finding necessary information from a large amount of data.

I am majoring in information science.