也可能是因为人类使用了抗生素，所以加速抗药基因在物种间的循环。
Another possibility is that human antibiotic use has promoted the circulation of resistance genes to other species.
例如，在去甲肾上腺素的刺激下，他们的心率加速得更快。
For instance, their heart rate shoots up more dramatically when stimulated by noradrenaline.
当我们遭遇危险时，肾上腺素就会大量分泌，心跳加速，血压升高，呼吸变快。
When we're confronted with danger, epinephrine (adrenaline) starts pumping, the heart speeds up, blood pressure increases, breathing quickens.
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