病毒 (bìng dú): vi rút

Every winter the flu virus is very active, and the hospital is crowded with patients who have colds and fevers.

Scientists are studying this new virus in the laboratory, hoping to find an effective vaccine as soon as possible.

After the computer caught a virus, all the files were locked, so he had to ask a professional to fix it.

This virus mainly spreads through the air, so doctors suggest we wear masks in public places.

After months of effort, the researchers finally succeeded in isolating the virus that causes this disease.