(S (S (SBAR (SBAR (S (ADVP (RB ゆっくり) (INRB と)) (S (PP-SBJ (NP (PP (BASENP (NN 火事)) (IN の)) (BASENP (NN 深刻) (NN 度))) (IN が)) (VP (VB 下がる)))) (NN うち)) (IN に)) (COMMA 、) (S (PP-SBJ (NP (PP (BASENP (NN 追加)) (IN の)) (NN 水)) (IN が)) (VP (PP (BASENP (NN 後)) (IN に)) (VP (VBV 届い) (VP (MD た)))))) (PERIOD 。))
ゆっくり と 火事 の 深刻 度 が 下がる うち に 、 追加 の 水 が 後 に 届い た 。
Additional water arrived later , as the severity of the fire slowly decreased .