单元 9 - 9D

A car phone is a telephone installed in a vehicle that allows the driver or passengers to make and receive calls while on the road. Car phones were popular before the widespread use of mobile phones, offering a way for people to stay connected while traveling. They were usually connected to a car’s electrical system and used a special antenna for signal reception. With the advent of mobile phones, car phones became less common, as portable phones offered greater flexibility. Today, many vehicles come with Bluetooth connectivity, allowing drivers to use their smartphones hands-free.

A cell phone is a portable electronic device used for making voice calls, sending text messages, and accessing various services such as the Internet, apps, and multimedia. It connects to a cellular network, allowing users to communicate over long distances. Modern cell phones, often referred to as smartphones, offer additional features like cameras, GPS, email, and access to social media platforms. Cell phones have become an essential part of daily life, helping people stay connected and manage various tasks, both personal and professional.

A payphone is a public telephone that requires the user to pay in order to make a call. Typically, users insert coins, tokens, or a prepaid card into the machine to cover the cost of the call. Payphones were commonly found in public spaces such as streets, airports, bus stations, and shopping centers, providing an option for communication when people were away from their personal phones. While their use has declined with the widespread availability of mobile phones, payphones are still available in some places, especially in emergencies or locations with limited mobile coverage.

A fire alarm is a safety device designed to detect smoke, heat, or fire and alert people to evacuate or take action. It typically includes sensors that detect signs of fire and a loud alarm to warn those nearby. Fire alarms are commonly found in homes, offices, and public buildings. Some systems are connected to fire departments or monitoring services, allowing for immediate assistance if necessary. Fire alarms are essential for providing early warning in case of a fire, helping to prevent injuries and damage. Regular testing and maintenance ensure they remain effective.

A burglar alarm is a security system designed to detect unauthorized entry into a building and alert the occupants or authorities. It typically consists of sensors placed on doors, windows, and other entry points, along with a control panel that triggers an alarm when the sensors detect movement or forced entry. Some burglar alarms are connected to a monitoring service, which can contact the police or security personnel if the alarm goes off. These systems help protect homes and businesses from theft or break-ins by providing an early warning and deterring potential intruders.

A smoke alarm is a safety device that detects smoke in the air and sounds an alarm to alert people of a potential fire. It works by using sensors to detect smoke particles, triggering a loud noise when smoke is present. Smoke alarms are commonly installed in homes and buildings, typically in hallways or near bedrooms, to provide early warning in case of a fire. Many smoke alarms also include a built-in battery, ensuring they remain functional even during power outages. Regular testing and maintenance of smoke alarms are important for ensuring safety.

A personal computer (PC) is a type of computer designed for individual use, typically in homes, schools, or offices. It includes a central processing unit (CPU), memory, storage, and input devices like a keyboard and mouse. Personal computers are used for a variety of tasks, such as browsing the internet, creating documents, playing games, and managing files. They run software applications that perform different functions, making them versatile tools for both work and entertainment.