《徐霞客游记·楚游日记二》
这时我们带的火把已经用掉了十分之七，恐怕回去的路途分辨不清，于是从前面所走的道路折了几次，穿过两道隘关，抵达透光处时，火把恰好燃尽了。
时余所赍火炬已去其七，恐归途莫辨，乃由前道数转而穿二隘关，抵透光处，炬恰尽矣。
At this time, seven-tenths of the torches we brought with us had been used up, and I was afraid that I would not be able to distinguish the way back, so I folded the road I had walked in front several times, passed through two passes, and arrived at the place where the light penetrated, just in time, the torch ran out.