I carried an umbrella because the rain impended. 我带了把伞,因为就要下雨了。
The presented computation methods are also applicable to stability analysis of catch drain, impended wall, open caisson and other excavation works during construction. 所述计算原则和方法也适用于分析截水槽、倒挂井、沉井及其他土石开挖工程在施工期的稳定性。