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"Crucially, the effort has been complemented by large-scale testing, including the start of randomized screening in select provinces, and systematic tracking via mobile phone apps to rapidly trace the contacts of any new positive cases," the experts noted.

"China will not tolerate any country hurting its core interests," Wei said, adding that the country's core interests include sovereignty, safety and the right to development. Wei is now vice-president of the China Center for International Economic Exchanges, a major government think tank.

"China's care about fighting air pollution and protecting the environment is motivated by its care about the health of Chinese citizens in the first place, which is a good thing that has led the country to vow a commitment to relevant international goals," said Magdy Allam, secretary-general of the Union of Arab Environmental Experts affiliated with the Cairo-based Arab League.

"China should not lose focus in reducing financial risks, and we have confidence that it will succeed in this difficult task," said Goldberg.

"China's import duty on US pecans had long been set at 24 percent, but since 2015, China agreed to reduce the tariffs twice - and now the rate is only 7 percent," said Matthew Bailey, a pecan grower in Georgia.