the city at one time must have been prosperous for it enjoyed a high level of civilization
这座城市一定曾经很繁荣，因为它享有高度的文明
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The city at one time must have been prosperous, for it enjoyed a high level of civilization. Houses -- often three storeys high -- were built of stone.
这座古城肯定一度很繁荣，因为它曾享有高度的文明，房子一般有3层楼高，用石块修建。
The city at one time must have been prosperous, for It enjoyed a high level of civilization.
这座古城在一个时期准是很繁荣的，因为它曾享有高度文明。
The ancient city at one time must have been prosperous, for it enjoyed a high level of civilization.
这个古城肯定一度很繁华，因为它曾享有很高的文明。
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