In 2003, Severe Acute Respiratory Syndrome (SARS) spread all over the world.

My grandfather contracted poliomyelitis when he was young.

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

A terrestrial planet may have an environment similar to Earth.

He is a salary thief, contributing nothing to the company.

He was dragging the heavy luggage.

Please open the door.

He is smart. Moreover, he is also good at sports.

Every day, I make it a point to go around the ground five times.

He sighed deeply.