9 - 9A 单元

Glasses are a type of eyewear that are worn for vision correction or protection from harmful light and radiation. They consist of a pair of lenses that are held in place by frames, which can be made of various materials such as plastic or metal. Glasses can be designed for various purposes, such as reading, driving, or working on a computer, and can come in different styles to match personal preferences and fashion trends. Some glasses also have special features such as anti-glare coatings or polarized lenses for additional protection and comfort.

Cardboard is a thick, rigid material made from layers of paper pressed together, commonly used for packaging, construction, and crafting. It is lightweight yet sturdy and can be easily cut, folded, or shaped. Cardboard comes in various forms, including corrugated cardboard, which has a wavy layer between two flat sheets, giving it extra strength. It is commonly used for making boxes, signs, and other items that require durability. In art and craft projects, cardboard is often used for creating models, sculptures, and other creative works due to its versatility and availability.

Clay is a soft, natural material made from tiny particles of rocks and minerals. It becomes moldable when wet, making it ideal for shaping into different forms, and hardens when it dries or is baked. Clay is commonly used in pottery, bricks, tiles, and other construction materials. It is also used in making art, like sculptures, due to its ability to hold fine details. Clay is valued for its versatility and ability to be shaped into many different items while remaining strong and durable.

Leather is a material made from the skin of animals, most commonly cows. It is known for its durability, flexibility, and strength, making it a popular choice for clothing, accessories, and furniture. Leather has a distinctive texture and appearance, with natural variations in color, grain, and markings that give it character and charm. It can be processed in a variety of ways to achieve different finishes, such as smooth, suede, or patent. Leather is also capable of developing a beautiful patina over time with wear and exposure to the elements. While it is a relatively expensive material, many people appreciate its timeless style, longevity, and quality. Overall, leather is a versatile and enduring material that adds a touch of sophistication and luxury to any outfit or space.

Marble is a type of natural stone known for its smooth texture and elegant appearance, often featuring unique patterns of veins or swirls. It forms from limestone under heat and pressure, which gives it a dense and polished surface. Marble is commonly used for flooring, countertops, sculptures, and decorative elements in buildings due to its beauty and durability.

Metal refers to a class of elements characterized by their usually solid and hard nature, as well as their ability to conduct heat and electricity. Metals typically have a shiny appearance, are able to be stretched, bent, hammered, or pressed into different shapes without breaking, and are found in various forms, such as gold, silver, copper, iron, aluminum, and zinc. They are widely used in manufacturing, construction, and various industries due to their strength, durability, and conductivity properties. Metals play a crucial role in modern society, serving as essential materials for building infrastructure, producing machinery and tools, and creating countless consumer products.

Stone is a naturally occurring solid material composed of minerals, rock fragments, and organic matter. It is commonly found in the Earth's crust and comes in various forms, colors, and textures. Stones can be classified based on their composition and origin, such as igneous, which is formed from cooled magma, sedimentary, which is formed from accumulated sediments, and metamorphic, which is formed from existing rocks undergoing heat and pressure. Stone is valued for its durability, strength, and aesthetic appeal, making it suitable for a wide range of applications, including construction, landscaping, sculpture, and jewelry. It can be shaped and carved into different shapes and sizes, and it is commonly used in building materials such as bricks, tiles, and countertops.