求一篇英语文章的大意

Our boat floated on, between walls of forest too thick to allow us a view of the land we were passing through, though we knew from the map that our river must from time to time be passing through chains of hills which crossed the jungle plains. Nowhere did we find a place where we could have landed: where the jungle did not actually spread right down into the river, banks of soft mud prevented us going ashore. In any case, what would we have sailed by landing? The country was full of snakes and other dangerous creatures, and the jungle was so thick that one would be able to advance only slowly, cutting one’s way with knives the whole way. So we stayed in the boat, hoping we reached the sea, a friendly fisherman would pick us up and take us to civilization.

We lived on fish, caught with home-made net of string（we had no hooks）, and fruits and nuts we could pick up out of the water. As we had no fire, we had to eat everything, including the fish, raw I had never tasted raw fis

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