閱讀下面短文，然后按照要求寫一篇150詞左右的英語短文．
Volunteering can make you happier and help you live longer，according to a new study．A research paper published on Friday in the journal BMC Public Health says doing good deeds for others improves your health．Researchers from the UK's University of Exeter reviewed 40 papers on the effects of doing voluntary work on our health．They found that volunteers had lower rates of depression（消沉），an increased sense of well-being，and a 22 percent reduction in the chances of dying within the next seven years．Australians lead the way in volunteering，with a 36 per cent of the population lending a hand．
Lead researcher Dr Suzanne Richards said："Our study shows that volunteering is associated with improvements in mental health，but more work is needed to show whether volunteering is actually the cause．"She added："It is still unclear whether biological and cultural factors and social resources that are often associated with better health are also associated with a willingness to volunteer in the first place．"In a study from the University of Michigan，researchers suggested three reasons why volunteering may be beneficial．First，it involves physical activity；second，the social connections we make help to reduce our stress；and third，it gives us a deep sense of happiness．
【寫作內(nèi)容】
用約30個詞概括上文的主要內(nèi)容．
用約120個詞談談志愿者工作的重要性，內(nèi)容包括如下要點：
對他人的重要性；對志愿者本人有何益處；我們應該怎樣對待志愿者工作．
【寫作要求】
作文中可以使用親身經(jīng)歷或虛構(gòu)的故事，也可以參照閱讀材料的內(nèi)容，但不得直接引用原文中的句子．
作文中不能出現(xiàn)真實姓名和學校名稱．
【評分標準】
概括準確，語言規(guī)范，內(nèi)容合適，篇章連貫．