By building houses in the steep canyons, Californians are tempting fate in the form of mudslides and fires.加州人把房子盖在陡峭的峡谷中，面对泥石流和火灾，他们是在玩命。The landscape was a series of mountains, chasms, canyons and valleys.那里的地形山峦起伏、峡谷纵横。Valleys often take the form of deep canyons.山谷时常呈现为纵深的峡谷。