On reaching mountains, the moisture is forced upwards 途经山脉的时候 水气被迫抬升
are forced upwards by the Himalayas. 经由喜马拉雅山脉抬升
forced up a huge dome of rock 500 miles wide, 形成了绵延500英里的巨大石丘
Whole populations of animals are now forced to travel great distances in pursuit of food and warmth. 动物们成群结队踏上 寻找食物和温暖的长途旅程