Sylvia and Paul Custerson, a retired couple from Cambridge, England, recently took a 16-day vacation to Namibia, where they went on bird-watching excursions.
出自-2011年6月听力原文
柯林斯高阶英汉双解学习词典释义
N-COUNT
短途旅行;远足
You can refer to a short journey as an excursion, especially if it is made for pleasure or enjoyment.
If you describe an activity as an excursion into something, you mean that it is an attempt to develop or understand something new that you have not experienced before.