短语讲解：

1. The World Wildlife Fund says more than half of the world's wildlife population has been lost.

more than 不只是; 很; 超过; 在…次以上
例句：Rob likes apples more than bananas. 
罗勃对苹果比对香蕉还喜欢。 

2. The conservation group says this has placed the health of the planet at risk.

at risk 有危险
例句：He saved three children alive at risk of his life. 
他拼命救出了三个孩子。 

3. The WWF says it is worried about the loss of and damage to Earth's environment.

worry about 担忧， 烦恼; 惦念
例句：If not, don't worry about it.
如果没有，也别担心。

4. So, we are consuming on average every year about the equivalent of about 1.5, one-and-a half times the resources available to the planet.

on average 平均起来
例句：Our reps make on average six calls a day . 
我们的销售代表平均每天打六次电话。 
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