正当他们哈哈大笑时，检票员来了。

As they guffawed loudly, the ticket collector arrived.

《柯林斯英汉双解大词典》

正当他们要坐下吃饭的时候，外面传来敲门声。

Just as they were about to sit down and eat, there was a knocking outside.

youdao

正当他们卷起毯子这空当，又有一个流浪汉走过来跟我们打招呼，他叫雅各布。

They're folding their blankets when another local homeless man, Jacob, walks up and says good morning.

youdao

Yeah, I don't think that they acted in a morally appropriate way.

对，我认为他们的行为在道德上不算正当。

耶鲁公开课 - 公正课程节选

I'm wondering if Dudley and Steven had asked for Richard Parker's consent in you know, dying, if that would exonerate them from an act of murder and if so, is that still morally justifiable?

我想知道达德利和斯蒂芬斯,是否征得过派克的同意，取他的性命，是否那样就能赦免他们的谋杀罪名,是否这样，道德上就是正当的？

耶鲁公开课 - 公正课程节选