Definition
to unexpectedly conceive an idea, particularly one that addresses a problem.
意外地想到；巧合地想出
He hit upon a great idea for solving the problem while he was out for a walk.
他在散步时意外想出一个解决问题的好主意。
While studying, she hit upon a plan that would help her ace the exam.
在学习时，她意外想到一个能帮助她考试得高分的计划。
After hours of thinking, he finally hit upon an inspiration to complete the project.
经过几个小时的思考，他终于灵光一闪，完成了这个项目。