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The work behind the seemingly small improvement was anything but easy, exemplified by the clean-up of Dianchi Lake, a victim of reckless industrial development, surging domestic sewage and once regarded as the filthiest body of water in China.
Liu noted that the Chinese people firmly supported the just cause of the South African and African people against apartheid and the two sides formed a deep bond of solidarity and mutual support in the process.
Meanwhile, the numbers of critically endangered species in China, including giant pandas, crested ibis, Yangtze alligators and Tibetan antelopes, have been increasing steadily, he said.
The pledge was made when visiting Chinese top political advisor Yu Zhengsheng held talks with Sri Lankan leaders.
China has a four-tier color-coded warning system for air pollution, with red being the most serious, followed by orange, yellow and blue.
来源：资阳报