英语听力：自然百科 秋日黄石公园 Autumn—17

 And for every dam, there is a new habitat for new life, and a richer, more diverse Yellowstone. 

 

But just as Yellowstone reveals the complexity¹ of life, it also exposes its fragility. On its lofty ridges², there are signs that all is not well with the whitebark pine. From above, it looks like autumn colors have come to an evergreen³ world. 

 

But these trees are dying. Small eruptions⁴ of resin⁵ dot the trunk of the tree—evidence of an invasion. Tiny beetles⁶ are chewing through the tree’s outer defences. Once inside, they lay eggs that turn into larva that eat the tree. Each tree that is lost threatens all the animals that rely on its autumn bounty⁷. 

 

The only thing that can stop the beetles is extreme cold. But recently, the climate here has been getting warmer and warmer. No national park can protect against that.

 

1 complexity   

n.复杂(性)，复杂的事物

参考例句：

• Only now did he understand the full complexity of the problem.直到现在他才明白这一问题的全部复杂性。
• The complexity of the road map puzzled me.错综复杂的公路图把我搞糊涂了。

2 ridges   

n.脊( ridge的名词复数 )；山脊；脊状突起；大气层的)高压脊

参考例句：

• The path winds along mountain ridges. 峰回路转。
• Perhaps that was the deepest truth in Ridges's nature. 在里奇斯的思想上，这大概可以算是天经地义第一条了。

3 evergreen   

n.常青树；adj.四季常青的

参考例句：

• Some trees are evergreen;they are called evergreen.有的树是常青的，被叫做常青树。
• There is a small evergreen shrub on the hillside.山腰上有一小块常绿灌木丛。

4 eruptions   

n.喷发，爆发( eruption的名词复数 )

参考例句：

• There have been several volcanic eruptions this year. 今年火山爆发了好几次。 来自《简明英汉词典》
• Over 200 people have been killed by volcanic eruptions. 火山喷发已导致200多人丧生。 来自辞典例句

5 resin   

n.树脂，松香，树脂制品；vt.涂树脂

参考例句：

• This allyl type resin is a highly transparent, colourless material.这种烯丙基型的树脂是一种高度透明的、无色材料。
• This is referred to as a thixotropic property of the resin.这种特性叫做树脂的触变性。

6 beetles   

n.甲虫( beetle的名词复数 )

参考例句：

• Beetles bury pellets of dung and lay their eggs within them. 甲壳虫把粪粒埋起来，然后在里面产卵。 来自《简明英汉词典》
• This kind of beetles have hard shell. 这类甲虫有坚硬的外壳。 来自《现代汉英综合大词典》

7 bounty   

n.慷慨的赠予物，奖金；慷慨，大方；施与

参考例句：

• He is famous for his bounty to the poor.他因对穷人慷慨相助而出名。
• We received a bounty from the government.我们收到政府给予的一笔补助金。