他们正在猎雄兔。

They are hunting for bucks.

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目的：评价十一酸睾酮（TU）对心力衰竭雄兔心功能的影响。

Objective: To study the effect of testosterone undecanoic acid replacement therapy(TU) on heart function in male rabbits with congestive heart failure(CHF).

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也可以当名词，意指雄鹿、雄兔、公羊或公山羊等特定的雄性动物。

Buck is also a noun that means a male of certain animal species such as deer, rabbits, sheep, or goats.

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