So what you do one day is you take a pile of arrowheads, and you walk up to the one that can't speak very well, and you put the arrowheads down in front of him, hoping that he'll get the idea that you want to trade your arrowheads for finished arrows.
有一天你带了一堆箭头 去找那个不太会说话的人 你把箭头放在他面前 希望他明白你想用箭头 交换做好的箭