吉普赛人的起源几乎没有文字记载，一直被谜团包裹着。
The origins of the Gypsies, with little written history, were shrouded in mystery.
全球范围内，在情人节售出的玫瑰达到了八千多万朵，情人节已经成为一个全球性行业。但是对于情人节的起源在历史上却没有明确的记载。
Although Valentine's day has become a global industry with more than 80 million roses sold worldwide, the origins of the day are unclear and hidden in the mists of time.
“搞怪节”的发言人琼·卡尼说，有关“搞怪节”的起源有众多的说法，但其确切起源并没有文字记载。
Jean Kearney, a spokeswoman for the festival, said there were many wildly inventive legends about how it began but no written record of the first event. "it."
系统的研究显示，许多现代语言起源于一个共同的母语，但由于没有文字记载，该母语已经失传。
A systematic study revealed that many modern languages descended from a common parent language, lost to us because nothing was written down.
系统的研究显示，许多现代语言起源于一个共同的母语，但由于没有文字记载，该母语已经失传。
A systematic study revealed that many modern languages descended from a common parent language, lost to us because nothing was written down.
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