He found that rats that exercise on a treadmill have raised levels of brain-derived neurotrophic factor coursing through their brains.
他发现，在跑步机上锻炼的老鼠，其大脑中流过的脑源性神经营养因子水平有所提高。
They discovered that animals living in the enriched environment had higher levels of a protein called brain-derived neurotrophic factor (BDNF).
他们发现生活在复杂环境下的小白鼠有一种名叫脑源性神经营养因子（BDNF）的蛋白质水平较高。
But when they were given a drug called brain-derived neurotrophic factor, or BDNF, they lost their fear.
但是当给他们使用一种含有脑源性神经营养因子的药物后，恐惧消失了。
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