(S (S (PP-SBJ (NP (S (S (PP (PP (NP (S-REL-NSBJ (VP (PP (BASENP (NN １８７０) (NN 年代) (NN 後半)) (IN に)) (VP (VBV 生まれ) (VP (MD た))))) (NN 男性)) (IN に)) (IN は)) (S (PP-SBJ (NP (PP (BASENP (NN ５１) (NN 歳)) (IN の)) (BASENP (NN 平均) (NN 寿命))) (IN が)) (VP (VBV あり)))) (COMMA 、) (S (PP (PP (BASENP (NN １９３０) (NN 年代)) (IN に)) (IN は)) (S (PP-SBJ (BASENP (NN 平均) (NN 寿命)) (IN が)) (VP (BASENP (NN ６９) (NN 歳)) (VP (MDV で) (VP (MDV あっ) (VP (MD た)))))))) (NN こと)) (IN が)) (COMMA 、) (VP (PP (PP (BASENP (NN 研究)) (IN で)) (IN も)) (VB 分かる))) (PERIOD 。))
１８７０ 年代 後半 に 生まれ た 男性 に は ５１ 歳 の 平均 寿命 が あり 、 １９３０ 年代 に は 平均 寿命 が ６９ 歳 で あっ た こと が 、 研究 で も 分かる 。
The study also reveals that a male born in the late 1870 's would have had an average life span of 51-years-old and in the 1930 's the average life span was 69-years-old .