What's the value of the indicator whose long definition is "Adolescent fertility rate is the number of births per 1,000 women ages 15-19." for the Arab World in 1960?
in 1960 refers to Year = 1960; for the Arab World refers to CountryName = 'Arab World'
SELECT T1.Value FROM Indicators AS T1 INNER JOIN Series AS T2 ON T1.IndicatorName = T2.IndicatorName INNER JOIN Country AS T3 ON T1.CountryCode = T3.CountryCode WHERE T2.LongDefinition = 'Adolescent fertility rate is the number of births per 1,000 women ages 15-19.' AND T3.ShortName = 'Arab World' AND T1.Year = 1960