1. Apples are common fruits in our life. It is nutritious, crisp and delicious, rich in minerals and vitamins, soluble and easily absorbed by the human body.

2. The nutritional value of Sydney is also very high, containing citric acid, vitamin B 1, B2, C and so on. It can moisten the lungs, clear dryness, relieve cough and eliminate phlegm. You can also cook some pear tea when you have a cold and cough, and the effect is also very good.

3. Papaya is rich in carotene and vitamin C, which has strong antioxidant and antiviral functions, and has a good effect on enhancing human immunity and resisting external viruses.

4. Lemon is rich in vitamin C, which has strong antibacterial and anti-inflammatory effects and enhances immunity.