2. Lemon is a dicotyledonous citrus plant in Rutaceae. Because of its extremely sour taste, pregnant women like to eat it best, so it is called beneficial mother fruit or beneficial mother and child. Lemon is rich in citric acid, so it is called "citric acid warehouse". Its juice is crispy and fragrant. Because of its sour taste, it can only be used as a high-grade condiment to prepare drinks, dishes, cosmetics and drugs.