英译汉！！！谢绝机器入内

Passengers in taxis , buses , and cars all breathe more pollution than cyclists and pedestrians, a new study shows. Researchers measured levels of levels of ultra-fine(极细微的),traffic-produced pollution particles(粒子的) on busy London streets using a newly developed particle counter fitted with a video recorder.

一份新的研究表明，那些乘出租车、汽车和小轿车的人比那些骑自行车和步行的人吸入更多的污染物。研究者用一种新发明的带摄像机的粒子计数器来测量繁忙的伦敦大街上由交通工具产生的极小的粒子层次。

The equipment allowed them to match particle levels with each of the five modes of transport. They also could identify what activities and behaviors lead to the highest exposures(暴露). On average, taxi passengers were exposed to just under100,000 and people in cars about 40,000.

这种设备可以将各种粒子层次分别与五种运动形态想匹配，还能够识别何种活动和行为能引起最高的污染度（曝光率）。一般说来，乘出租车的人暴露在十万单位的污染物中，乘小轿车的乘客暴露在四万单位的污染物中。

Pedestrians and bicyclists, meanwhile , were exposed to counts of just 5 ,000 and 8 ,000 , respectively. Ultra-fine particles are so small that large amounts can be breathed in a single breath, after which they can settle in the lungs and damage cells.

与此同时，骑自行车和步行的人们则分别暴露在仅5000和8000单位的污染物中。

细微粒子由于体积太小，所以人们会在单次呼吸中就吸入大量的污染物粒子，这些粒子会停留在肺中损伤细胞。

Would the results hold true in New York City or elsewhere? We generally found that the trends such as pedestrians having the lowest exposures and the in-vehicle exposures being much higher to be common across different countries,” study co-author Surbjit Kaur of Imperial College London said, “However, the concentrations(浓度) do vary due to different local conditions, such as traffic, meteorology, building layout, and configuration. “

在纽约或者其他地方会跟伦敦有同样的结果吗？伦敦帝国学院的合作研究人说：“我们发现一个普遍的现象，虽然在不同国家，但是步行者总是生活在污染粒子浓度最小的地方，而交通工具内的污染浓度就要高得多。然而，污染物的浓度确实会因当地条件不同而有所差异，这些条件包括交通状况、气象因素、建筑设计和城市布局。”

People sitting in a vehicle in the middle of heavy traffic are directly in the path of the pollutant source---other vehicle’ s mufflers. Pollution in cars is less than in other vehicles most likely because cars generally spend less time in traffic than taxis and buses, Also, private cars tend to be cleaner to begin with.

那些在交通繁忙地段车中的人们，就直接暴露的污染源之中，污染源就是其他车辆的烟筒。轿车中的污染会比其他车辆的污染度轻一些，主要是因为轿车在路上的时间比出租车和公车少很多，而且私家车在使用之前也比其他车干净得多。

Bikers stick mostly to the outer edges of the street, where pollution levels are lower. People on the sidewalk are even further away.

自行车行者基本都是在污染程度低得多的街边，而步行者就更加远离污染。