第 3 单元 A 课

A dictionary is a reference book that provides definitions, pronunciations, and other information about words. It typically includes entries organized alphabetically, with each entry offering details such as the word’s meaning, usage, and grammatical information. Dictionaries may also provide information on word origins, synonyms, and antonyms. They are used to understand and clarify the meanings and correct usage of words in both written and spoken language.

Sunglasses are a type of eyewear designed to protect the eyes from sunlight and high-energy visible light that can cause discomfort or damage to the eyes. They typically have lenses that are darkened or polarized to reduce glare and block UV rays. Sunglasses come in a variety of styles, including aviators, wayfarers, and cat-eyes, and can be made with different materials such as plastic, metal, or wood. Some sunglasses also feature additional features like gradient lenses or mirrored coatings. They are often worn as fashion accessories, but can also be used for sports or outdoor activities where eye protection is important.

An umbrella is a portable device designed to protect a person from rain or sunlight. It consists of a canopy made of waterproof material such as nylon or polyester, supported by a central shaft with ribs that extend to the edges of the canopy. Umbrellas can be collapsible or non-collapsible, with the former being the most common. Collapsible umbrellas can be further divided into three types: compact, folding, and automatic. A compact umbrella folds down to a very small size, making it easy to carry in a bag or purse. A folding umbrella has two or more sections that fold in on itself for compact storage. An automatic umbrella has a mechanism that allows it to be opened and closed with the push of a button. Umbrellas are often used as a fashion accessories and come in a wide range of colors, styles, and designs.

A watch is a timepiece designed to be worn on a person's wrist, typically with a strap or bracelet. Watches come in various styles and types, including analog, digital, and smartwatches. Analog watches use a traditional dial and hands to display time, while digital watches use a digital display to show the time, often including other features such as a stopwatch, alarm, or backlight. Smartwatches have many advanced features, including the ability to make phone calls, receive text messages, and track fitness activity. Watches can be made of different materials, including metal, leather, plastic, and rubber, and are often worn as a fashion accessories in addition to their functional purpose of telling time.