作为一个学习胜地，牛津的起源可以追溯到中世纪。
As a place of learning, Oxford's beginnings go back to the Middle Ages.
维基词典指出，“无附加条件”这一说法的起源可以追溯到古代。
Wiktionary tells us that the origin of the expression "no strings attached" may date back to ancient times.
我们睡眠不足危机的起源可以追溯到一个世纪前灯泡的发明。
The beginning of our sleep-deficit crisis can be traced to the invention of the light bulb a century ago.
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