【教えて下さい】「No prior experience ...」の意味

Shiraki had questioned the wretched working conditions she saw at a mine when she visited India as a student, and had no prior experience with jewelry. So she studied at a jewelry school and learned how to make jewelry and acquired the required skills.
学生時代に訪れたインドの鉱山での劣悪な労働環境に疑問を抱いていた白木社長にとって、ジュエリーの分野は前職とは無関係であったが、ジュエリー制作の学校で作り方を学び、技術を身につけた。

http://ejje.weblio.jp/sentence/content/No+prior+experience+required