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1.The 45-year-old animal was put down by his carers at a zoo in Kenya after "age-related complications".
put down 杀死 (危险或病重的动物)
The judge ordered their dog Samson to be put down immediately.
该法官下令立即杀掉他们的狗萨姆森。
2.There were more than 2,000 northern white rhino in the wild in the 1960s but their numbers continually dwindled because of the value of their horns.
dwindle 下降；减少
The factory's workforce has dwindled from over 4,000 to a few hundred.
该厂的工人总数已从4000多减少到了几百人。
