1.The 45-year-old animal was put down by his carers at a zoo in Kenya after "age-related complications".
put down 殺死 (危險(xiǎn)或病重的動(dòng)物)
The judge ordered their dog Samson to be put down immediately.
該法官下令立即殺掉他們的狗薩姆森 。
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;減少
The factory's workforce has dwindled from over 4,000 to a few hundred.
該廠的工人總數(shù)已從4000多減少到了幾百人 。