悬浮微粒、特别是印度地区，生产和生活燃煤所带来的炭黑，才是真正的元凶。
Particulate matter, particularly black carbon from cooking fires and coal-fired plants in India, is the real culprit.
采用两步工艺法制备具有二次微粒结构的白炭黑，并对其性能进行研究。
The silica with secondary particle structure was prepared by a two-step process, and its properties were investigated.
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