In spite of all we have learned from space flights, the moon is still a riddle from the distant past-and will be for a long time to come.

尽管我们已经从空间飞行中了解了一些，月球仍然是来自遥远过去的一个谜，而且仍将会在未来很长一段时间如此。

youdao

Although Brand's riddle had been around for 20 years, this was the first time, as far as I know, anyone had actually tried it.

虽然布兰德的谜题已流传了20年之久，但据我所知，这还是第一次有人尝试真正动手试验。

youdao

But the riddle of what underlies handedness remains. Its proportions - roughly 90 percent of people are right-handed and 10 percent left-handed - stay consistent over time.

但是，偏手性始终是个谜。它的比例——人群中大约90%是右手使用者，10%是左手使用者——始终保持不变。

youdao

Again the Rabbi turned, again the young man pleaded, and the Rabbi recounted the exact same riddle one last time.

FORBES: The Rabbi's Four Leadership Lessons, Part 1

Last year, following the birth of her first foal, a colt, Rachel Alexandra also spent time at Rood and Riddle for what was described as a precautionary measure for pain management after her delivery.

FORBES: 2009 Horse Of The Year Rachel Alexandra In "Serious" Condition After Complications Following Foaling