英语听力：自然百科 冰冻星球 前往地球尽头—10
时间：2018-12-26 作者：英语课 分类：自然百科2012年
英语课
The bison/ form a defensive 1 circle around their young, horns pointing outwards 2.
The wolves need the bison to break rank, but the tables are turning and now the wolves have to retreat. The pack focus their attention on the rear of the herd 3 and the bison/ begin to panic.
A young bison falls behind. Even this yelling dwarfs 4 the wolves. Running head down, the herd's only thought is to escape, a stroke of luck for the wolves. The kill will feed the pack for several days but then they will have to resume the chase. At the frozen ends of our planet the struggle for survival never eases. South of the tree line, the winters are shorter, so trees grow faster and taller and forests begin to appear.
1 defensive
adj.防御的；防卫的；防守的
- Their questions about the money put her on the defensive.他们问到钱的问题，使她警觉起来。
- The Government hastily organized defensive measures against the raids.政府急忙布置了防卫措施抵御空袭。
2 outwards
adj.外面的，公开的，向外的；adv.向外；n.外形
- 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。