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Carbon dioxide is used to produce carbonated beverages and in food production. 

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Cao Youfeng, deputy head of the Mohe Public Security Bureau's Border Control Brigade, said: "When the river freezes, the surface is not as flat as many people assume. Actually, it's very uneven, and the wind is unbearable. The officers can only patrol about 8 km in a day. That's how difficult it is."

Chang praised the canines as well. "People get sleepy, and machines sometimes malfunction. But the dogs are alert even when they're sleeping. They are the most reliable line of defense."

Cathay Pacific also condemned all illegal activities and violent behavior, which seriously undermine the fundamental principle of "one country, two systems" as enshrined in the Basic Law.