For a long time biologists believed that male deer used buck rubs not only to clean and polish antlers but also to provide practice for the ensuing male-to-male combat during the rut.
长期以来，生物学家们认为雄鹿擦痕不仅可以清除并磨光鹿茸，还可以借此练习发情期时雄鹿之间的角斗。
Since at least Darwin time, biologists have been trying to understand and define the mechanisms for speciation.
至少从达尔文时代开始，生物学家就一直在试图理解和定义物种形成的机制。
The fishermen know the approximate time of year when they will be allowed to fish, but on any given day, one or more field biologists in a particular area can put a halt to fishing.
渔民们知道一年中允许捕捞的大概时间段，但是在某些日子，一个地区可能有一个或多个实地生物学家中止捕鱼活动。
SOME fish have special proteins in their blood to stopthem from freezing to death—a remarkable evolutionary trait made no less so bythe fact that biologists have known about it for some time.
某些鱼的血液里存在特殊蛋白质，可以让它们不致冻死——生物学家对此早已有所认识的事实，丝毫不影响对这一显著的进化性状的惊奇。
Plenty of biologists still say it's a mirage because we will never overcome the biological programme whereby cells die after a certain time, or indeed the rigours of wear and tear on the genome.
很多生物学家仍认为停止衰老只是一个幻想，因为我们永远不能克服细胞过段时间就会死亡，以及基因组的消耗磨损等生物程序。
Molecular biologists have been transferring genes between species, one at a time, since the 1970s; their work has given us genetically modified crops and biotechnology drugs.
自20世纪70年代以来，分子生物学家已在物种之间转移基因，一次转移一种基因；他们的工作给我们带来了转基因农作物和生物技术药物。
In the face of this and other evidence a growing group of conservation biologists say try everything at the same time.
面对这些情况和其他证据，愈来愈多的自然资源保护生物学家说：应该同时尝试所有可行的办法。
"Any time we lose a species it diminishes us all." Biologists captured 16 rabbits in a remote area of Douglas County in 2001 to start the captive breeding program.
2001年，生物学家在道格拉斯县的一处偏远地区捕捉到了16只这种侏儒兔，并从那时开始了哥伦比亚盆地侏儒兔的圈养繁殖计划。
Biologists have found a new way to peer back 130 million years in time, illuminating the catastrophic period in which the dinosaurs perished and birds and mammals arose.
生物学家找到了一种观察到1亿3千万年前的历史的方法，让我们去了解恐龙灭绝而鸟类和哺乳动物繁荣起来的那段充满灾难的时期。
But just how a perfectly symmetrical embryo settles on what's right and what's left has fascinated developmental biologists for a long time.
但是完全对称的胚胎如何分辨左侧和右侧让发育生物学家感到迷惑。
Based on warming experiments using greenhouses, biologists have known for some time that shrubs will grow at the expense of the other tundra plants when the climate warms.
透过在温室进行的暖化实验，生物学家已经知道：当气候温暖，灌木会在苔原植物受损时取而代之。
Time was when biologists somewhat over worded the evidence that these creatures preserve the health of game by killing the physically weak, or that they prey only on "worthless" species.
曾经有段时间，生物学家或多或少滥用了一种证据，即这些生物通过杀死体弱者来保持种群的健康，或者说它们仅仅捕食没有价值的物种。
Time was when biologists somewhat over-worded the evidence that these creatures preserve the health of game by killing the physically weak, or that they prey only on "worthless" species.
曾几何时，生物学家们有点过度使用这个证据，即这些物种通过杀死体质弱者或者仅捕食那些它们认为无价值的物种来维持食物链的正常运转。
How has natural selection determined the evolution of gene regulation by acting on major regulatory factors? This question has been attractive to many evolutionary biologists for a long time.
自然选择如何通过作用于重要调节因子而决定基因调节的进化方式，一直是进化生物学家感兴趣的话题。
And he may have set an all-time record for what biologists call reproductive success.
而且他还为生物学家称谓的繁殖成就创下了一项永远无人打破的纪录。
For the first time, biologists have documented the gorillas in the wild, using simple tools to perform rudimentary tasks such as poking a stick in a swampy pool of water to check its depth.
生物学家第一次在野外观察到了大猩猩利用简单的工具完成原始的任务，例如用一根棍子戳入沼泽水塘以试探其深度。
Any time we lose a species it diminishes us all. "Biologists captured 16 rabbits in a remote area of Douglas County in 2001 to start the captive breeding program."
2001年，生物学家在道格拉斯县的一处偏远地区捕捉到了16只这种侏儒兔，并从那时开始了哥伦比亚盆地侏儒兔的圈养繁殖计划。
Any time we lose a species it diminishes us all. "Biologists captured 16 rabbits in a remote area of Douglas County in 2001 to start the captive breeding program."
2001年，生物学家在道格拉斯县的一处偏远地区捕捉到了16只这种侏儒兔，并从那时开始了哥伦比亚盆地侏儒兔的圈养繁殖计划。
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