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It is also an occasion for them to get together with their families, Zhang added.

Measures have been taken to prevent secondary disasters, such as inviting sodium cyanide producing enterprises to help at the site, using hydrogen peroxide to reduce the amount of sodium cyanide, sending a special taskforce to locate and measure the area contaminated by sodium cyanide, and prevent its spreading in sewage.

The system should follow the principles of common but differentiated responsibilities, equity and respective capabilities, he added.

The products' emergence has also highlighted China's rising investment as well as booming trade with countries along the Belt and Road.

The main contentious issues include the implementation of the international community's supervision over Iran's nuclear program and the pace of sanctions relief.