慢速英语:Earth's Ozone Layer Shows Signs of Recovery

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短语讲解：

1. He says a lot has changed for the better since the UN agency released its last report on ozone depletion four years ago.

a lot 非常多
例句：The firms have to do a lot of work before investing.
这使得基金公司不得不在投资之前做许多的工作。

2. It protects the Earth from harmful ultraviolet radiation.

protect from 保护， 保卫
例句：Wild wood should be well protect from excessive hag. 
野生森林应该被保护以免过量砍伐。 

3. The report finds the discontinuation of ozone-depleting substances has been good for the world climate.

be good for 值得，有效; 利于
例句：Mild depression may be good for work.
轻微的沮丧可能对工作有好处。

4. This is because many of these substances also are strong greenhouse gases -- pollution linked to climate change.

link to 与…连接， 联系
例句：Research finds genetic link to some types of gum disease. 
研究发现遗传与某些牙龈疾病有关。