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Vehicles, coal-burning, airborne dust and industrial production account for 85 to 90 percent of the major airborne pollution sources in most Chinese cities, new research shows.
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“��Ҫ��ȾԴ”������major pollution source��ʾ,���҂����������c(di��n)�P(gu��n)ע�Ķ��Ǵ����Ⱦ(airborne/air pollution),���䌍(sh��)��������Ⱦ(soil pollution),��������Ⱦ(sea pollution),���h(hu��n)����Ⱦ(environment pollution)�Ȇ��}Ҳ���ݺ�ҕ��Airborne���˱�ʾ“�՚��е�”,��߀��“�ս���,�����յ�”��˼������,��The allies landed thousands of airborne troops.(��܊��Ͷ�˔�(sh��)ǧ�˵Ŀս����(du��),��)
�˴��о��Y(ji��)������������,������,���V�ݡ����ڵ���Ҫ��Ⱦ��Դ�ǙC(j��)��(d��ng)܇(vehicles),��ʯ���f,���Ͼ�����Ҫ��Ⱦ��Դ��ȼú(coal-burning),������Ϻ�,����������Ҫ��Ⱦ��Դ�քe�ǓP(y��ng)�m(airborne dust),������(d��ng)Դ(mobile sources)�����I(y��)���a(ch��n)(industrial production),��

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