进化生物学家对人类为什么会变老及死亡仍存在分歧。
The question of why we grow old and die still divides evolutionary biologists.
根据生物学家对老鼠的实验研究，睾酮水平高可能是导致疾病传播的一个重要原因。
High levels of testosterone may be a key factor in spreading disease among mice, according to biologists.
因此今年早些时候。生物学家对能获得海军的帮助感到非常高兴。他们现在能对一只特定的蓝鲸进行长达43天的跟踪，并记录它发出的声音。
So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds.
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