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(zhí)行轉(zhuǎn)換。

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

　　現(xiàn)在，聆聽把映射應(yīng)用到150號規(guī)則所產(chǎn)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(fā)現(xiàn)，我可以用很少的代碼實(shí)現(xiàn)這種類型的動(dòng)態(tài)映射。