1. An English article about vitamin A being an essential nutrient for human body. Its important part is retinyl, which exists not in a single compound, but in several forms. In animal-derived foods, the main form of vitamin A is alcohol (retinol), but it can also exist in the form of aldehyde (retinaldehyde) or acid (retinoic acid). Precursors of vitamins (provitamins), as some members of carotenoid family, exist in food of plant origin. [ 1]

All forms of vitamin A have a β -ionone ring with an isoprenoid chain attached to it. This structure is very important for the activity of vitamins. [1] The orange pigment of carrot-β-carotene-can be expressed as two connected retinyl groups. Retinyl attached to protein is the only major light absorber in vision, and the name of this compound is related to the retina of the eye.

Vitamin A comes in many forms:

Retinol, an animal form of vitamin A, is a yellow fat-soluble vitamin, which plays an important role in vision and bone growth. Because of the unstable form of alcohol, vitamins are usually produced and taken in the form of retinyl acetate or retinyl palmitate.

Other retinoids, a class of compounds chemically related to vitamin A, are used in medicine.

2. English translation of vitamins How do you say vitamins in English? The dictionary defines vitamins (usually use this or omit the e at the end) vitamins (e) vitamins; Vitamin auxohormome vitamin nutramin(e)[ medicine] vitamin citrin vitamin p, limonin bilingual example 1. Fresh fruits and vegetables provide plant cellulose and vitamins.

Fresh fruits and vegetables provide fiber and vitamins. It is suggested that you supplement vitamin E and vitamin A in your daily diet. I suggest supplementing vitamins E and A in my diet. Satisfied, please adopt it? .

3. Translate the following sentence 1. In English, vegetables contain many vitamins.

Many people took part in this activity.

Activities, including some students

Students can use the library.

This reference book is designed for universities.

student

Students are not allowed to play with mobile phones in the classroom.

Class.

Basically no problem. I hope I can help you. I don't know. Welcome questions.

4. Answer vitamins in English:

Any fat-soluble or water-soluble organic substance, which is essential to the normal growth and activities of the body in trace amounts, is naturally obtained from plant and animal food.

Vitamins:

One of various fat-soluble or water-soluble biological substances, a small amount of which is essential for the growth and activities of organisms, and is usually obtained from plant foods.