n.放牛的；牧牛者
Just like a cowherd drive的三人称单数形式" target="_blank">drives cows to pasture with a stick, so old age and death drive the life of living beings. 如同牧牛者以棍棒驱赶牛群至牧场，老与死亦在驱逐著众生的寿命。
