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我叫马三顺
the,序数词都要加the
yoyobear1988
at his fifties
stella59444
简单就是When he is fifty其他就是When he is at the age of 50When he is fifty years old
木姑娘Zara
in his fifties
呼啦啦呼嘞嘞
at somebody's fifty
四叶草人生
in sb's fifties
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