阅读理解。

During the fight against the novel coronavirus （新冠病毒）, many nurses work day and night. They are very brave and kind.

People often call nurses the "angels in white". But did you notice? They don't always wear white clothes. Sometimes they wear other colors, too. Nurses wholook afterchildren often wear pink. Nurses working in operating rooms（手术室） wear green. Those who take care of old people often wear blue.