The content of metal elements in particles are higher in residents-commercial -transportation mixed district than that in administrative-education district, and are higher in winter than in fall.

颗粒物中金属元素含量商业交通居民混合区大于行政文教区，冬季浓度大于秋季。

youdao

Almost ridiculously so, and sadly universities and the commercial enterprises affiliated with higher education seem unconcerned with changing that reality.

CNN: Your e-mails: Students paying off the past