Watch: Astronauts return to Earth after extended stay in Space
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"They're losing lots of habitat - lots of woodland," says Spencer. "And we're also knocking down old buildings, making our homes warmer, more airtight - there are less places for them to go."
银发经济：人口结构变迁下的十二万亿蓝海
12月20日，龙玥城购物中心，市民在购物。新京报记者 王贵彬 摄