Functional analysis is a branch of mathematics that studies the properties of functions in infinite-dimensional spaces.

The Mesolithic is the era between the Paleolithic and the Neolithic.

The Riemann sum is a method for approximately calculating the integral of a function.

I stabbed the needle for the injection.

He was feeling loneliness.

He provided a detailed explanation to elucidate the issue.

This job is suitable for him.

He obtained a copy of his family register at the city hall.

His car is red.