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德国的人口老化，出生率下降
déguó de rénkǒu lǎohuà ， chūshēnglǜ xiàjiàng
Germany's population is ageing, and the birth rate falling
这些机器设备正在老化
zhèixiē jīqìshèbèi zhèngzài lǎohuà
these machines are getting old
随着另一种树森林老化，一种树会取代
suízháo lìngyī zhòngshù sēnlín lǎohuà ， yī zhòngshù huì qǔdài
one species of tree replaces another as a forest ages
加速老化
jiāsù lǎohuà
accelerated aging
老化迹象
lǎohuà jìxiàng
signs of aging
