a 100,000 avalanches devastate the slopes every winter. 每年冬季会发生10万次毁灭性的雪崩
and they're growing bigger every year. 而且面积每年都在增大
Every year three million caribou migrate across the Arctic tundra. 每年 300万迁徙的北美驯鹿 都将穿越北极苔原