动词短语
中文翻译：突然落下
同义词：
['fall upon', 'come down upon']
例句：
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1.The raindrops began to fall upon the rooftop.
雨滴开始落在屋顶上。
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2.The thief dropped upon the guard and stole his sword.
盗贼突然落在守卫身上，偷走了他的剑。
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3. The new policy was dropped upon us without warning.
新政策突然降临在我们头上，毫无预警。