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Confronted with an "unprecedented" outbreak of the novel coronavirus, China has done a "remarkable" job in limiting the spread of the disease, said leading experts in the US.

Co-organized by China's National Office Against Pornographic and Illegal Publications and tech giant Tencent, the campaign named "Bring Internet Security to Classrooms" will run from September to December and cover rural areas in over 10 provincial-level regions.

Concerns have been raised in the US about what the two presidents discussed at their meeting.

Co-organized by the China Center for Urban Development (CCUD), a public institution directly under the National Development and Reform Commission, and the World Health Organization, the seminar was attended by urban planning professionals from all over the world, as well as some local governors from China.

Colorants are produced from rare earths and sulfides under mild conditions, without using hydrogen sulfides and other toxic materials.