正当

In a sentence

• 正当我们准备出发，突然下起了大雨。

  Just as we were about to set off, it started raining heavily.

  Here, '正当' is used to indicate a certain time coinciding with an action, emphasizing simultaneity.

• 他现在的行为是完全正当的，没有违反规定。

  His current action is entirely legitimate and does not violate the rules.

  In this example, '正当' is used as an adjective that means 'proper' or 'justifiable'.

• 经过一番争论，我们终于达成了一个正当的协议。

  After some debate, we finally reached a reasonable agreement.

  Here, '正当' is employed to describe something as fair, reasonable, or equitable.