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"China, and by extension Asia, is the main producer of synthetic diamonds," Margaux Donckier, spokeswoman for Antwerp World Diamond Center, told Xinhua. "Synthetic goods only represent about 3-5 percent of the [consumer] market, but the share is growing rapidly."

In 1999, China and Portugal properly resolved the question of Macao, setting a fine example for other nations in tackling issues left over from history through friendly negotiations, he said.

In the past year, the central government has adopted a series of concrete measures to make it more convenient for Hong Kong residents to study, work or live in the mainland, involving purchase of railway tickets and simplified application procedures to study, work or live in the mainland, he said.

Disorders of circadian rhythm are associated with many human diseases, including sleep disorders, depression, diabetic mellitus, cancer and neurodegenerative diseases, such as Alzheimer's disease.

Qinghai started to invest heavily in solar energy in 2009. And in the past few years, it started to build two 10 million kilowatts renewable power generating bases.