赌马时押这匹冷门马简直是40比1的赔率，但意外夺冠了。

Betting on this underdog horse was like ___40-to-1 odds, but it surprisingly won the race.

飞行员确保发动机的燃油与空气混合比保持在40比1的最佳状态。

The pilot ensured the engine maintained an optimal ___40-to-1 fuel-to-air ratio.