三轮车的介绍，英文，在线等

A tricycle (often abbreviated to trike) is a three-wheeled vehicle. While tricycles are often associated with the small three-wheeled vehicles used by pre-school age children, they are also used by adults for a variety of purposes. In the United States and Canada, adult-sized tricycles are used primarily by older persons for recreation, shopping, and exercise. In Asia and Africa, tricycles are used primarily for commercial transportation, either of passengers in pedicabs, or of freight and deliveries.
Human-powered trikes are usually powered by pedals, although some models have hand cranks. Motorized trikes can be powered with a variety of methods, including motorcycle engines, smaller automatic transmission scooter motors, and electric motors. The term "tricycle" may or may not include motorized Three Wheeled Cars, depending on local laws.

The cycle rickshaw is a small-scale local means of transport; it is also known by a variety of other names such as pedicab, cyclo, or trishaw. The term Rickshaw is used more broadly, and also refers to auto rickshaws, and the, now uncommon, rickshaws pulled by a person on foot. Cycle rickshaws are human-powered, a type of tricycle designed to carry passengers in addition to the driver. They are often used on a for hire basis. Cycle rickshaws are widely used in major cities around the world, but most commonly in cities of South, Southeast and East Asia.

The vehicle is powered by a driver as one would a bicycle, though some configurations are equipped with an electric motor to assist the driver. The vehicle is usually a tricycle, though some quadracycle models exist, and some bicycles with trailers are configured as rickshaws. The configuration of driver and passenger seats vary by design, though passenger seats are usually located above the span of the longest axle. For example, in most of South Asia, the passenger seat is located behind the driver on a "delta" tricycle, while in Indonesia and Vietnam the driver sits behind the passenger seat on a "tadpole" tricycle. In the Philippines, the passenger seats are usually located beside the driver.

Cycle rickshaws are known as cyclo (pronounced see-clo) in Cambodia and Vietnam, cycle rickshaw in India and Bangladesh, trishaw (traditional Chinese: 三轮车; simplified Chinese: 三轮车; pinyin: sān lún chē) from "tricycle rickshaw", in Malaysia and Singapore, becak in Indonesia and bicitaxi or taxi ecologico (literally "ecological taxi") in Mexico. In the Philippines, they are called tricycle/traysikel, traysikad (a pun on the verb sikad, meaning, to stomp), pedicab, or padyak. Cycle rickshaws are known as saika in Myanmar, a transliteration of English "side car". In the United Kingdom and United States cycle rickshaws are more widely pedicabs[citation needed]. In Buffalo, New York, this type of vehicle is known as a bike taxi.
In Thailand, any three-wheeler is called samlor (Thai: สามล้อ, which literally means "three wheels"), whether motorized or not, including pedicabs, motorcycles with attached vending carts or sidecars, etc. The driver is also called samlor. True, Thai auto rickshaws are known in popular parlance as tuk-tuks but, in Thai, the latter usage as well as its characteristic style is largely restricted to Bangkok and Chiangmai.