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Idiom · four-character fixed expression
To Know Autumn from a Single Leaf
传统表达classical sourcesfour-character fixed expression
to know autumn from a single leaf
Keeps the original cultural image visible.
to infer a broader change from one early sign
Expresses the idiom's function in present-day communication.
Bilingual examples
从这些小变化可以一叶知秋，但仍需要更多证据确认。
These small changes may signal a broader shift, though more evidence is still needed.