Complex numbers are represented by a combination of real numbers and imaginary numbers.

He is suffering from a lung disease.

I am very interested in social science.

In English, adding 's' after a noun makes it a plural form.

This problem has multiple answers.

How is an adverb used in a sentence?

I learned double-entry bookkeeping at university.

A complex number is a combination of a real number and an imaginary number.

We are aiming for a society where all people can enjoy welfare.

He is suffering from lung cancer.