More efficient , though - especially when sorting a million items at a time , as is common in bioscience , finance , and other domains - is to go to the trouble of creating a special - purpose " reverse table . " while this operation takes time , it allows the sorting to be very fast 更加有效特別是每次對一百萬項進行排序時,這在生物科學、金融和其它一些領域很常見就要專門創(chuàng)建專用的“反向表” 。盡管這項操作很耗時,但是它使排序變得非??焖?。