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Peng Yingdeng, a research fellow at the National Engineering Research Center for Urban Environment Pollution Control, said that only by finding the cause of air pollution could the government come up with more targeted measures.

People try to make jade ornaments at the intangible cultural heritage interactive area of the media center of the Conference on Dialogue of Asian Civilizations (CDAC) in the China National Convention Center in Beijing, May 15, 2019. The opening ceremony of the CDAC was held here Wednesday. [Photo by Wang Zhuangfei/chinadaily.com.cn]

Pfizer officials had urged the US to initially purchase 200 million doses, or enough for its two-shot regimen for 100 million people last summer, according to people knowledgeable about the issue who spoke on the condition of anonymity because they weren't authorized to discuss the situation. But officials declined, choosing instead for 100 million doses, or enough for 50 million people, they said.

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Peng added the upcoming travel boom will likely embrace features of industrial tourism– which counts factories and work heritage sites among its top destinations, similar to French wine tours and Netherland's cheesemaking visits－that has received renewed interest in recent times.

Pesticides are expensive and pose threats to the environment and those applying the chemicals to the fields. Crop rotation can slow the spread of the pest, but not eliminate it because the nematode goes dormant until soybeans are again planted in the field. Genetically modified seeds produce soybeans resistant to most current types of nematodes but have the effect of selecting a variant of the pest that can survive, Mitchum said.

Peng, who is followed by 6.4 million fans on China's most popular micro blog Sina Weibo, is regarded as a box-office draw for young fans in the competitive summer vacation film release calendar.

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People in Tianjin wade through a flooded road in heavy rains on Tuesday. Traffic in the city was severely affected by torrential rains, and some roads of the city were closed.Zhou Wei / For China Daily

Peering through the window from the sidewalk, GeekWire also spotted rows of sandwiches, bottles of Smartwater and Peligrino, and the entry-exit scanning gates to the store.

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People visit the stand of Cainiao Network during the Computing Conference 2018 in Hangzhou city, East China's Zhejiang province, Sept 19, 2018. [Photo/IC]

People wear masks at Dalian International Airport in Dalian, Northeast China's Liaoning province on Jan 22, 2020. [Photo/sipaphoto.com]