ensure

Compared meaning: promise or make sure something is true (verb).

比较义项：保证、确保、担保（动词）。

• assure

  Assure means to tell a person something to remove their doubt or worry; it takes a person as its object, unlike ensure and guarantee.

  assure 意为告诉某人某事以消除其疑虑或担忧，宾语通常是人，这一点与 ensure 和 guarantee 不同。

  The pilot assured the nervous passengers that the turbulence was normal.

  飞行员向紧张的乘客保证，这次颠簸是正常现象。

• ensure 本词

  Ensure means to make certain that something happens or is true, focusing on actions or conditions rather than reassuring a person directly.

  ensure 意为确保某事发生或属实，侧重于行动或条件，而不像 assure 那样直接安抚某人。

  The manager ensured that every fire exit remained unlocked during the event.

  经理确保活动期间每个安全出口都保持畅通未上锁。

• guarantee

  Guarantee expresses a strong, often formal promise that something will definitely happen or be true, implying responsibility or consequences if it fails.

  guarantee 表示强烈、通常正式的承诺，保证某事必定发生或属实，往往意味着若未兑现需承担责任或后果。

  The manufacturer guarantees the laptop for two years against any defects.

  制造商为这台笔记本电脑的质量缺陷提供两年保证。

Assure, ensure, and guarantee all mean making something certain or believed, but in different ways. Assure means calming a person's doubts. Ensure means acting to make sure something really happens. Guarantee is a strong, formal promise, often with responsibility if it fails.

这三个词都表示让人相信某事为真或会发生，但方式不同：assure 重在对人消除疑虑，ensure 重在通过行动使某事确实发生，guarantee 则是正式而有力的承诺，常隐含责任或后果。