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Lumps in the testicles could be many things .

睾丸内的硬块可以是很多东西。

Dark testicles might protect birds from mutation , scientists find .

科学家们发现，深色的睾丸可能保护鸟类免受变异的伤害。

Blue fairy wrens have testicles 25 % their body weight .

蓝鹩莺的睾丸重量占身体总重的四分之一。

These findings could explain why such inky testicles are mysteriously found throughout the animal kingdom .

这些发现可能解释了为什么这些漆黑的睾丸在动物王国中神秘的被发现了。

You should tell your doctor about any lumps or swelling in your testicles .

如果你的睾丸内有硬块或肿胀，你应该如实告诉你的医生。