1. leotard: a tight piece of clothing that covers the body but not the legs, usually worn by female dancers or women doing physical exercise (from Cambridge on-line dictionary) 連身衣
2. The first, second, third, fourth, and fifth position:
(1) http://video.about.com/dance/The-Five-Ballet-Positions.htm
(2) Every movement and pose in ballet begins and ends with one of the five basic positions.
(3) Pierre Beauchamp, French dancer, choreographer and ballet master, is credited with inventing the five positions of classical ballet. He believed by mastering the foot positions, dancers would be better able to perfect more advanced steps with ideal form and technique. (from http://dance.about.com/od/ball2/f/Position_Ballet.htm )
