In the process of transportation, to prevent knock against and violent vibration, to prevent rain water.

运输过程中，要防止磕碰和剧烈震动，要防止雨淋水浸。

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Ancient buildings tend to have a huge roof and extended eaves. This is to prevent rain from dampening the walls.

古代建筑习惯用大屋顶和出檐，目的是防止雨水淋湿墙体。

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Russia has likewise been known to attempt to overseed clouds to prevent rain from spoiling outdoor activities in Moscow.

类似地，人们也知道，俄罗斯也曾经试图通过观察云的动向来人工消雨，以避免破坏莫斯科的户外活动。

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National Weather Service officials said Sunday several river regions were at "record flood territory, " and while rivers in many locations were close to cresting, additional rain over the coming days could prevent them from receding quickly.

WSJ: Midwest Fights Off Rising Floodwaters