But they believed the magnetism to be of little use in judging longitude, leaving it a mystery as to how the turtles know their east from west.
然而，他们认为在辨识经度上磁场帮不上忙，所以海龟如何分辨东西方位仍然是个谜。
Justin Willis, an East Africa researcher at Britain's Durham University, says Sudan's oil industry is deep in mystery.
英国杜伦大学的东非研究员贾斯汀·威利斯称苏丹的石油行业非常神秘。
If so, the treatment could hold great promise in tackling the mystery epidemic of myopia affecting East Asia in particular.
如果真是这样，这样的治疗就大大提高了揭示东亚如此多的人近视秘密的保证。
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