adj.侵入的；接近的
动词approach的现在分词形式.
Because they are more likely to pose a threat, approaching sounds most readily stimulate regions of the brain associated with motor action, he explains. 他进一步说明，这是因为接近的声音比较可能具有威胁性，所以更容易刺激大脑中与动作有关的区域。
