英语听力：自然百科 冰冻星球 前往地球尽头(9)

The bisons form a defense¹ circle around their young, horns pointing outwards². The wolves needs the bisons to break rank, but the table is turning, now the wolves have to retreat, the pack focuse their attention on the rear of the herd³, and the bisons begin to panick, a young bison falls behind, even this yelling wolves the wounds, running head down, the herds⁴ only thought to escape, a stroke of luck for the wolves. The kill will feed the pack for sevaral days, but then they will have to resume the chase, at the frozen end of our planet, the struggle for survival never eases. South of the treeline, the winters are shorter, so trees grow faster and taller, and forests begin to appear.

野牛围绕幼仔角朝外形成防御网。狼需要野牛自我暴露弱点,但现在形势扭转,现在狼准备撤退,他们的注意力聚焦在牛群的最后,野牛开始夺命奔逃,一只年轻的野牛落在后面,即使这样狼群仍然继续追逐,牛群只想到逃跑,运气转眼间到了狼这边。这些天蓄积的杀戮被完全释放,然后他们将继续追捕,在我们这个冷冻的星球,生存永远都是不易。南部的山林由于冬季较短,所以树长得更快、更高、森林开始出现。

1 defense   

n.防御，保卫；[pl.]防务工事；辩护，答辩

参考例句：

• The accused has the right to defense.被告人有权获得辩护。
• The war has impacted the area with military and defense workers.战争使那个地区挤满了军队和防御工程人员。

2 outwards   

adj.外面的，公开的，向外的；adv.向外；n.外形

参考例句：

• Does this door open inwards or outwards?这门朝里开还是朝外开？
• In lapping up a fur,they always put the inner side outwards.卷毛皮时，他们总是让内层朝外。

3 herd   

n.兽群，牧群；vt.使集中，把…赶在一起

参考例句：

• She drove the herd of cattle through the wilderness.她赶着牛群穿过荒野。
• He had no opinions of his own but simply follow the herd.他从无主见，只是人云亦云。

4 herds   

兽群( herd的名词复数 )； 牧群； 人群； 群众

参考例句：

• Regularly at daybreak they drive their herds to the pasture. 每天天一亮他们就把牲畜赶到草场上去。
• There we saw herds of cows grazing on the pasture. 我们在那里看到一群群的牛在草地上吃草。