I can't read the sentence, but from reading the answer I am a little confused by the translation. In the United States we would not say "rigorous pines". Rigorous is not an adjective used to describe a tree. We might say "sturdy pines", which would imply that the men are strong like a tree.

Cold bamboos lean over the valley creek. How many stones are lying here!... The men are like proud bamboos and rigorous pines.