they create the biggest of all sand storms 造成了世界上最大的沙尘暴
but it contains more than 50 percent of all its plants and animals. 但其中的动植物种类却占到了全球的50%
and their strength is more or less constant all year round. 全年始终或多或少地 受到这种影响力的控制
contains a third of all the trees on Earth 容纳了地球上1/3的树木
Nearly half of all cubs die in their first year out on the ice. 大约有近一半的幼熊 会在第一年的冰上历险中丧生
The penguins stay when all other creatures have fled 其它动物早已逃离 只有企鹅留了下来