我们已经调查研究了什么原因导致总有晚睡的人，其中一个貌似合理的解释就是他们的生物钟长于24小时。
'we've been investigating what causes people to be late sleepers and one of the most plausible explanations we're perusing is that their body clocks run longer than 24 hours.
加拿大研究人员缩小了导致儿童脑癌的原因，他们说，总有一天癌症的治疗水平会提高并且给患者一个更高质量的生活。
Canadian researchers have narrowed in on a cause of childhood brain cancer, a discovery they said could one day lead to improved cancer treatments and better quality of life for patients.
加拿大研究人员缩小了导致儿童脑癌的原因，他们说，总有一天癌症的治疗水平会提高并且给患者一个更高质量的生活。
Canadian researchers have narrowed in on a cause of childhood brain cancer, a discovery they said could one day lead to improved cancer treatments and better quality of life for patients.
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