【正确答案】：
CONVERSION IS GENERALLY CONSIDERED TO BE A DERIVATIONAL PROCESS WHEREBY AN ITEM IS ADAPTED OR CONVERTED TO A NEW WORD CLASS WITHOUT THE ADDITION OF AN AFFIX. HENCE THE NAME ZERO-DERIVATION. 
【题目解析】：一般认为，转类法是单词不添加词缀而直接转换为一个新词的派生构词过程。这一过程由于不加词缀，所以又称零派生。
