Quad. 四輪摩托車

A resident of Uyuni drives his quad. 烏尤尼的居民駕駛四輪摩托車.

A resident of Uyuni drives his quad on Salar salt lake of Uyuni, Bolivia, before the seventh stage of the Dakar Rally 2014 that will be held from Salta to Uyuni.
January 12, 2014  http://www.voanews.com/media/photogallery/january-12-2014-day-in-photos/1828484.html

Gisele Bündchen rides a quad bike with her daughter Vivian.

Not the most safe form of trasnsport: Gisele Bündchen rides a quad bike with her daughter Vivian in one arm, in Costa Rica
Read more: http://www.dailymail.co.uk/tvshowbiz/article-2538741/Gisele-B-ndchen-carries-baby-one-arm-rides-quad-bike-rough-terrain-Costa-Rica.html#ixzz2qOVgLPEB
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Quad

Stefan Krause, Germany
File:KTM Quad 990 neutral.jpg - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/File:KTM_Quad_990_neutral.jpg

All-terrain vehicle - Wikipedia, the free encyclopedia
An all-terrain vehicle (ATV), also known as a quad, quad bike, three-wheeler, or four-wheeler
http://en.wikipedia.org/wiki/All-terrain_vehicle
全地形車 - 維基百科，自由的百科全書
http://zh.wikipedia.org/wiki/%E5%85%A8%E5%9C%B0%E5%BD%A2%E8%BB%8A

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