It can be used as a simple passing comment, right?

这可以作为一个简短的评论，是吧？

With a passing comment, my friend helped me see my own situation more clearly.

朋友的一句无心之语反倒让我看清了我自己的处境。

This is not verified and surely the Luftwaffe did not need this passing comment to inspire their strategic plans.

这是未经证实的，当然，德国空军不需要这个偶然的评论来激发他们的战略计划。

Thus, when Hofmann made some passing comments about the desirability of a synthetic substitute for quinine, it was unsurprising that his star pupil was moved to take up the challenge.

因此， 当霍夫曼对奎宁的合成替代品的可取性发表了一些顺便的评论时，他的明星学生被感动接受挑战也就不足为奇了。