assurance

The CEO gave his personal assurance that no employees would lose their jobs.

(Chinese) 首席执行官亲自保证，没有员工会失去工作。

I need some assurance that the car has been properly serviced before I buy it.

(Chinese) 在我买车之前，我需要某种保证，确认这辆车已经过妥善保养。

She spoke with the assurance of someone who has years of experience in the field.

(Chinese) 她说话时带着那种在该领域拥有多年经验者的自信。

His calmness and assurance during the crisis inspired the rest of the team.

(Chinese) 他在危机期间的冷静和自信激励了团队的其他成员。