If not, then transformations have to be performed in the mapping phase.

　　如果沒有，則在映射階段必須執行轉換。

　　Now, listen to the melody generated by applying this mapping to rule 150.

　　現在，聆聽把映射應用到150號規則所產生的旋律。

　　I was pleasantly surprised how I could achieve this type of dynamic mapping with so little code.

　　我驚喜地發現，我可以用很少的代碼實現這種類型的動態映射。