The doctors suggest covering your legs with support stockings and walking every hour or so during the trip.

VOA: special.2009.07.14

every child will go on a school trip to the Museum of Natural History.

每个孩子都会参加学校组织的旅行，去参观自然历史博物馆。

自然历史博物馆 - SpeakingMax英语口语达人