问答题
Because the ancient Egyptians defined the hour as one-twelf of the time from dawn to dusk, its length varied during the course of the year.
【正确答案】正确答案：one-twelf一one-twelfth
【答案解析】解析：句意：由于古埃及人将从破晓到黄昏分成十二等分，每一份为一个小时的长度，所以一年四季中这种长度是不等的。十二分之一应表示为one-twelfth。