fallen upon

• v. 落在(开始；进攻)

fallen upon的用法和样例：

例句

1. He fell upon the new idea and after a long time of hard work wrote an important paper on it.
   他下苦功思考这一新观点，经过长时间的艰苦工作，写了一篇论文，对此进行阐述。
2. His speech fell upon unlistening ears.
   没有人注意听他的演讲。