9. prevent... from... 防止……;阻止…… ◆ 疯狂操练 The weather prevented the flight from leaving. (恶劣的天气使得飞机无法起飞。) ◆ 疯狂实战 A: We must prevent AIDS from spreading. B: This disease is a serious problem. A: 我们必须防止艾滋病的漫延。 B: 这种疾病是个很严重的问题。