Upon arrival是一个英语短语，意思是“到达时”或“抵达时”。它通常用于描述某人或某物到达某个地方的瞬间。在旅行领域，它经常用于描述旅客到达目的地的瞬间，例如“Upon arrival in Paris, we were greeted by a beautiful view of the Eiffel Tower.”

同时，在商业和工作场合，这个短语也经常被使用。例如，“Upon arrival at the office, the employees were greeted by their new boss and given a tour of the facilities.”

总的来说，upon arrival这个短语可以用于各种情况下，表示某人或某物到达某个地方的瞬间。