Mother would accumulate the river sand into a large heap drying in the open and then riddle with a screen before selling to the building boss.

母亲需要把捞上来的河沙堆积成一个巨大的沙丘，在空气中晾晒干后，用筛子再筛一次，然后才能卖给建筑商。

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After tried to figure out this old riddle with the help of the newest computer technic, the Bristain's scientists said the answer is most likely the chicken.

英国科学家在应用最新电脑技术尝试破解这一古老谜题后宣称，很有可能是先有鸡后有蛋。

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They had to do with the riddle of his existence.

他们必须解开他的存在之谜。

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Greedy authors, greedy agents, brainless book chains with their Vivaldi-riddle espresso bars, publishers owned by metallurgy conglomerates, operated by glacially cold bean-counters in Geneva.

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Friends who have known each other for decades, or siblings who get along well and are comfortable spending long periods of time with one another, would also be suitable for this sort of situation, said Jason Kring, assistant professor at Embry-Riddle Aeronautical University, who is not involved with the mission.

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Had we not written the book we would never have known that and been able to provide experts with that information that may help solve the riddle of why our society is growing more and more violent.

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