CREATE TABLE table_37608 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Attendance" FLOAT, "Record" TEXT)

What's the loss of the game with the opponent of the Nationals with a score of 7-1?
SELECT "Loss" FROM table_37608 WHERE "Opponent" = 'nationals' AND "Score" = '7-1'
SELECT "Loss" FROM "table_37608" WHERE "Opponent" = 'nationals' AND "Score" = '7-1'