With no road signs and few maps, they had to put their trust in directions passed by word of mouth and in secret signs -- nails driven into trees, for example -- that conductors used to mark the route north.
With no road signs and few maps, they had to put their trust in directions passed by word of mouth and in secret signs -- nails driven into trees, for example -- that conductors used to mark the route north.
没有路标，也几乎没有线路图，他们赶路全凭着口口相告的路线以及秘密记号――比如树上钉着的钉子――是乘务员用来标示北上路线的记号。