We went to the zoo with our family on the weekend.

My grandfather contracted poliomyelitis when he was young.

A positive-definite matrix is an important concept in linear algebra.

A positive-semidefinite matrix is one of the important concepts in linear algebra.

This 'hanaichimonme' is very beautiful, isn't it?

He is the type of person who understands ten from hearing one.

This is a once in a lifetime opportunity, so please don't miss it.

We will make this project successful by working together with one mind.

The Uniform Resource Locator indicates the address of a web page.

He was the first discoverer of that new species of plant.