单元 4 - 4B

Salt is a mineral compound composed of sodium and chlorine ions. It is one of the most commonly used seasonings and food preservatives worldwide. Salt is essential for human health, playing a crucial role in regulating fluid balance, nerve function, and muscle contraction. In food preparation, salt is used to enhance flavor, balance sweetness, and inhibit the growth of microorganisms, thereby acting as a natural preservative. It is utilized in a wide variety of culinary applications, including cooking, baking, pickling, and curing. While salt is essential in moderate amounts, excessive consumption can contribute to health issues such as hypertension and cardiovascular disease.

Coffee is a popular beverage that is made from roasted coffee beans, which are derived from the berries of the Coffea plant. It is enjoyed by millions of people around the world for its rich flavor, stimulating effects, and cultural significance. Coffee can be brewed in a variety of ways, including drip coffee, espresso, French press, and pour-over, and can be served hot or cold. It contains caffeine, which is a stimulant that can help improve mood, increase alertness, and enhance cognitive performance. Coffee also has a complex and nuanced flavor profile, with notes of chocolate, caramel, fruit, and nuts, depending on the roast and brewing method. It is often enjoyed as a morning pick-me-up, a midday treat, or an after-dinner digestif.

A knife is a sharp-edged tool or utensil used for cutting, slicing, or preparing food. Knives come in various shapes and sizes, each designed for specific tasks in the kitchen. Common types of knives include chef's knives, utility knives, paring knives, bread knives, and steak knives. They typically consist of a blade, which is the sharp cutting edge, and a handle for gripping and maneuvering the knife. Knives can be made of various materials, such as stainless steel, carbon steel, or ceramic, and they are essential tools for chopping vegetables, slicing meat, and performing other food preparation tasks.

A glass, in the context of drinkware, is a container used for serving various beverages, including water, juice, soda, cocktails, and other alcoholic and non-alcoholic drinks. It is typically made of transparent or translucent material, such as glass or crystal, allowing the contents to be visible. Glasses come in a wide range of shapes, sizes, and designs, each suited for different types of drinks and occasions. They may have stems and bases, or they may be stemless, depending on the style and functionality.

A shirt is a type of garment that covers the upper body and typically has sleeves, a collar, and a buttoned or zippered front. Shirts come in various styles, fabrics, and designs, and are worn by both men and women. They are often made of cotton, linen, or synthetic materials, and can be casual or formal in style. Shirts can be worn as a standalone garment, or layered with other clothing such as jackets or sweaters. Some common styles of shirts include t-shirts, polo shirts, dress shirts, and button-up shirts.

A finger is a slender and flexible digit located at the end of the hand, typically numbering five on each hand. It consists of multiple bones called phalanges, along with muscles, tendons, nerves, and blood vessels. Fingers play a crucial role in gripping, grasping, manipulating objects, and performing intricate tasks. They contribute to fine motor skills, sensory perception, and communication through gestures. Understanding the anatomy and function of fingers is important for hand coordination, dexterity, and overall manual abilities.