Original: Whedon, Serenity: Director's Commentary, track 7 "Mr. Universe" Jewel Staite as Kaywinnit Lee "Kaylee" Frye:  the ship's mechanic, has an intuitive, almost symbiotic, relationship with machines and is, consequently, something of a mechanical wizard.
Simplified: Whedon, Serenity: Director's Commentary, track 7 "Mr. Universe" Jewel Staite as Kaywinnit Lee Frye.