A narrow zone that marks the geological boundary between an upland region and a plain, distinguished by the occurrence of waterfalls and rapids…
| 单词 | θ2321 |
| 释义 | the world > the earth > land > landscape > high land > mountain > [noun] > range > area at foot of > line demarcating (1) fall line1882 A narrow zone that marks the geological boundary between an upland region and a plain, distinguished by the occurrence of waterfalls and rapids… |
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