- a natural junction, running parallel to the E coast of the US, between the hard rocks of the Appalachians and the softer coastal plain, along which rivers form falls and rapids
| 单词 | fall line |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 fall′ line′,
Collins Concise English Dictionary © HarperCollins Publishers:: Fall Line n
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