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But before these robotic systems take flight for commercial purposes, one thing has to be considered: They need to safely maneuver through the skies, avoiding everything from skyscrapers to news helicopters to hot air balloons. And, of course, other drones.

But he said that using open market operation tools, including the Standing Lending Facility, is more flexible than cutting the reserve requirement ratio if the central bank wants to adjust liquidity compared with the "broad irrigation" of money, he added.

But escape games are not without their critics, especially as they expand into residential districts.

But experts sounded a note of caution. A sudden surge in demand amid the epidemic cannot guarantee long-term growth. Efforts are needed to exploit emerging opportunities in a way to ensure sustainable development, they said.

But not all the koalas were lucky enough to go back home. She noted that some koalas were dead when they found them, while some others were too seriously injured to be saved. So they had to euthanize them.