excursion

演讲者在谈论气候变化时，简短地偏离主题讨论了一下新能源技术。

The speaker made a brief ___excursion into renewable energy while discussing climate change.

演讲者在讨论经济问题时，简短地穿插了一个有趣的历史故事。

During the talk about economic issues, the speaker made a brief ___excursion into an interesting historical story.

我们周末去山上进行了短途郊游。

We went on a weekend ___excursion to the mountains.