例句與造句

1. Much later, economists demonstrated that the theory of fructification can be stated rigorously in a general equilibrium model.
2. On the question of why interest rates are normally greater than zero, in 1770, French economist Anne-Robert-Jacques Turgot, Baron de Laune proposed the theory of fructification.
3. It's difficult to find theory of fructification in a sentence. 用theory of fructification造句挺難的