Wehaveasmallbackgardenwithseveraltrees，sobirdnestinabun...
問題詳情：Wehaveasmallbackgardenwithseveraltrees，sobirdnestinabundance.Therefore,itis 41 yearafteryeartofindmanyyoungbirdsdon’t 42 .Onemorningtwoyearsago,Ifoundayoungblackbirdsittingstill,ve...