He found that rats that exercise on a treadmill have raised levels of brain-derivedneurotrophicfactor 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。
2
Increased levels of brown fat may also be attributed to an increase in a brain chemical called brain-derivedneurotrophicfactor [BDNF] found in the sociable mice.
在社会性的小鼠大脑中发现，褐色脂肪的增加可能还归因于大脑中的一种化学物质，称为脑源性神经营养因子。
3
But when they were given a drug called brain-derivedneurotrophicfactor, or BDNF, they lost their fear.