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Can a tree help prevent crime? It just might. Two new studies, led by US Forest Service researchers, took a closer look at urban green space in Philadelphia, Baltimore and Youngstown, Ohio. In each of these cities, adding green space to crime-ridden areas helped reduce crime rates, the researchers found. 种树可以预防犯罪吗？有可能哦。美国林务局研究员做的两项最新研究仔细调查了费城、巴尔的摩和俄亥俄州扬斯敦的市区绿化情况。研究人员发现，在这三个城市中，在治安糟糕的区域增加绿化面积可以有效减少犯罪率。 In 2000, Philadelphia launched a program to plant vegetation along roadways to help soak up rainwater. Researchers looked at 52 of these vegetation plots and compared them with control plots that didn't receive the greenery upgrade. After tracking 14 types of crime in nearby areas, researchers found that narcotics possession in those areas decreased by 18 to 27 percent, even as the rate for the rest of the city rose by 65 percent. 2000年，费城启动了一个项目，在道路两旁种植绿化带吸收雨水。研究者们观察了52处绿化点，与没有进行绿化改造的对照区进行对比。在追踪了附近14种犯罪手段之后，研究者发现，这些区域的毒品持有量下降到27%，下降了18个百分点，尽管这一数字在城市的其它地区还上涨了65个百分点。 | 
