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"Every reputable health institution says wearing a mask is one of the most effective things people can do to protect others from contracting COVID-19, especially in places like an aircraft, where social distancing is a challenge," Toby Enqvist, United's chief customer officer, said in a statement.

"Excessive production capacity reduction in the iron and steel and coal mining sectors had improved the quality of supply, raised prices of products and led to much higher corporate profit levels," said He.

"Elderly people have long-term healthcare needs and are usually homebound. The government and local community are trying to help people to stay at home," she said.

"Eight out of the 11 Chinese schools in Belgium sent representatives to the training," said the school's principal, Wang Xiaomei.

"Economic and social development contributes significantly in eliminating insecurity issues caused by the lack of a partner," she added.