1 B2 习语 正式
想到或发现一个好主意、计划或解决办法,常常是偶然或灵光一现。
"Newton is said to have hit upon his theory of gravity after observing a falling apple."
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He hit upon the idea of using a rubber band to hold the papers together.
— The Economist (paraphrased journalistic usage, widely attested pattern)
不可分离