n.呜呜叫声
动词purr的现在分词形式.
Sensitivity to this type of purring may even be innate in humans, drawing from a primal drive to respond to crying babies. 这种呜呜叫声类型的敏感性，甚至可能在人类来说是与生俱来的，从原始的驱动器绘图回应嗷嗷待哺的婴儿。
n.支脉；刺激；马刺；鞭策
vt.刺激；鞭策；促进
