【正确答案】If trains had not been invented, if nobody had laid railway tracks into remote mountains, small villages like Tai-er Gou (Tai-er Gully) would never have been found. The village and its villagers, in around 15 houses, hid in the deep wrinkles of an old mountain, silently accepting the willful mountain's tender caress and brutal temper.
   But now, two slim, glittering railway tracks stretched over the mountain. They bravely spiraled halfway up, then quietly felt their way further, wound and curved before finally arriving at the foot of Tai-er Gou (Tai-er Gully). Then they made their way into the gloomy tunnel, dashed ahead to another mountain, and hurried away into the mysterious distance.