VOA慢速英语:关于新型冠状病毒，我们都知道哪些

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mammal - n. a type of animal that feeds milk to its young and that usually has hair or fur covering most of its skin

pneumonia - n. a serious disease that affects the lungs and makes it difficult to breathe

practice - n. the action of doing or using something

tip - n. a piece of advice or useful information