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MACAO, Dec. 20 (Xinhua) -- Tens of thousands of Macao people participated in a series of activities and events to celebrate Macao's 18th anniversary of returning to China and the establishment of Macao Special Administrative Region (SAR) on Wednesday.

President Xi Jinping presented award certificates to them at an annual ceremony held in Beijing to honor distinguished scientists and research achievements.

Yok said that the New Party will continue to adhere to the one-China principle and oppose "Taiwan independence" to further boost cross-Strait communication and cooperation in all fields.

Zhao Ruxiang, an expert with China's Yantai Oil Spill Response Technical Center, said a simulation test showed condensate oil in the water can evaporate so quickly that it will leave little residue - less than 1 percent after five hours.

According to the 2014 counter-espionage law, the law could also apply to the work of state security and public security agencies in preventing and stopping acts that undermine national security.