| 单词 | Betula nigra |
| 释义 | Betula nigra (once / 1969886 pages) n WORD FAMILY Betula nigra n birch of swamps and river bottoms throughout the eastern United States having reddish-brown bark Syn|Hyper black birch, red birch, river birch birch, birch tree any betulaceous tree or shrub of the genus Betula having a thin peeling bark |
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