Slowly I walked round the edge of the water, my comrades in Indian file behind me.

我慢慢地绕着水边走， 我身后是印地安战友。

Between the two ran the irregular tracks, so narrow in places that they had to travel in Indian file, and so rough that only practised riders could have traversed it at all.

在这中间，只有这条曲曲弯弯的小道。有些地方十分狭窄，只容单人通过。山路崎岖难行，只有长于骑马的人才能通过。