口头

In a sentence

• 这只是一个口头承诺，不算正式的协议。

  This is just a verbal promise, not a formal agreement.

  In this sentence, '口头' is used to describe something being expressed verbally rather than in written or formal form.

• 他喜欢用口头方式来表达自己的想法。

  He likes to use verbal methods to express his thoughts.

  Here, '口头' is used to emphasize the verbal nature of communication or expression.

• 老师给了我们一个口头通知，说明考试的时间有变化。

  The teacher gave us a verbal notice, indicating that there was a change in exam time.

  In this case, '口头' represents that the notice was communicated verbally instead of being provided in writing.