长时间站立后，他感到腿部有些不适。

After standing for too long, he felt some ___discomfort in his legs.

当他提到那个敏感话题时，房间里明显弥漫着不适的气氛。

There was a clear sense of ___discomfort in the room when he brought up that sensitive topic.

新鞋磨脚是长途步行时常见的小困扰。

The new shoes ___causing ___discomfort are a common issue during long walks.