第3课  An unknown Goddess

1、  The city at one time must have been prosperous, for it enjoyed a high level of civilization.

这座古城肯定一度很繁荣，因为它曾享有高度的文明

Must have。。表示推测

2、  She stood three feet high and her hands restedon her hips.

    她身高3英尺，双手叉腰。