With so many left behind, one can only imagine how many they took with them, "says Fang with great pain. But while carrying out his research over the past few years, Fang has paid even greater notice to the marks left by another species of human intruder. The river beds are full of jeep tracks.
但近幾年來在山裡做研究，方力行更注意到另一件人類留下的足跡：河川淺水區的溪床上有許多吉普車的車輪痕跡。