青藏高原海拔4000米左右的地方,夏季草地碧绿,牛羊成群。这里的天气变化无常,一天之内竟有四季。年平均气温只有-1.5℃,最热的月份气温也只有10.5℃,到了夜里还会有霜出现。“六月雪”在这里并不少见。植物种类很少,除了牧草之外,什么树木也没有。鸟类由于无树营巢,大多钻到洞穴中去了。有的鸟就失去了飞翔 The Qinghai-Tibet Plateau is located at an altitude of 4,000 meters above sea level. Summer grassland is green and there are flocks of cattle and sheep. The weather here is fickle and there are four seasons in one day. The average annual temperature is only -1.5°C, and the hottest month is only 10.5°C. There will be frost at night. “Snow in June” is not uncommon here. There are few plant species and there are no trees other than pasture. Because of the no-tree nesting, most of the birds went into the cave. Some birds lost their flight