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。
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。
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。
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