我的朋友们，上一世纪的这一重大考验，本世纪正在展开的事件，都证明美利坚合众国对推动和平和捍卫自由起着决定性的作用。

My friends, the momentous trials of the last century, and the unfolding events of this century, attest to the decisive role of the United States in advancing peace and defending freedom.

youdao

他也相信它产生的信息，不仅对未来的火星航线有决定性的价值，也对人类心理学的泛化理解有重大作用。

He also believes that the information it will generate will be of crucial importance not just to any future Mars voyage, but to the broader understanding of human psychology.

youdao

内燃机缸内的气流运动和燃烧过程对发动机的整机性能有着重大的影响，是降低燃油消耗、减少排放和燃烧噪音的决定性因素。

With increasing restrictions on engine emissions, the need for reduced fuel consumption and low vibration, air motion and chemical reaction in the cylinder of diesel engine play an important role.

youdao