51 年底 [-] niándǐ (year-end) end of the year: 去年/今年/明年/每年~ the end of last year/this year/next year/every year || 到~ at the end of the year || ~前 before the end of the year ' 30 刑满 [-滿] xíngmǎn (sentence-completed) complete a prison sentence: ~释放 serve a sentence and be freed || 到年底~ complete a prison sentence at the end of the year || ~出狱 get out of prison after completing a sentence '
end of the year