However, to our disappointment, in spite of the fact that a great number of trees are planted in spring and autumn every year, few trees planted by green hands survive. 【句型拓展】

　　类似的常用句型有：

　　1. If all those trees had survived, the city would have become a garden

　　2. Deforestation now accounts for about 20% of carbon dioxide emissions each year.

　　3. A single tree will absorb one ton of carbon dioxide over its lifetime.

　　4. Shade provided by trees can also reduce your air conditioning bill by 10 to 15%.

　　5. Since we can get so much from making our cities greener, we should spare no effort to do that.

　　6. Experts have come up with proper advice on protecting such cultures.

　　7. Recent efforts toward the greening of our cities have achieved much, although the results are still far from satisfactory.

　　8. For example, the green space available on average to each Shanghai citizen is only 0.4 Mu while every Londoner has more than 20 Mu. 9. First and foremost, media, as a product of scientific advance, provides a quick access to the spread of the traditional culture, helping people to set up a sense of preservation.

　　10. We are trying to do whatever we can to….

　　11. … has become the focus of attention worldwide.

　　12. I would like to outline some reasons for it. First, …; second….

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