在其他一些情形中，人们也许不能有效控制他们的中脑导水管周围灰质和其他的中脑部区域。
In other cases, people may not be able to keep their periaqueductal gray and other midbrain regions under control.
不过，小脑扁桃体和中脑导水管周围灰质是大脑的两个古老原始的区域，可以追溯到亿万年前。
But the amygdala and the periaqueductal gray are ancient parts of the brain, dating back hundreds of millions of years.
相似的，置入心脏瘢痕肌肉区域的CRT起搏器导联可能不会从该疗法获得任何益处。
Similarly, CRT pacemaker leads delivered to regions of scarred heart muscle may prevent any benefit from this therapy.
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