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It also introduces an electronic system to track vaccines from production to use. For instance, vaccination data, including a vaccine's information, expiry date, use date, medical workers who issue the vaccines and their recipients should be recorded and retained for at least five years after the expiry of the vaccine, according to the draft.

Officially known as the Asia Security Summit, the Shangri-La Dialogue has been organized and convened annually by the British think tank International Institute for Strategic Studies and the Singaporean government since 2002.

Haikou, Lhasa and Shenzhen ranked top three on the list of 168 cities' air quality in the first five months while cities in the provinces of Hebei, Henan and Shanxi lagged behind.

China is also willing to work with Cambodia and other ASEAN countries to maintain multilateralism and support free trade, he added.

However, some countries outside the South China Sea have obviously violated their commitments of not taking a position on the South China Sea issue, and have openly increased their involvement in the South China Sea, thus significantly increasing instability in the South China Sea, said the Chinese official.