| 单词 | purple rock brake |
| 释义 | purple rock brake (extremely rare) n WORD FAMILY purple rock brake n very short shallowly creeping North American fern usually growing on cliffs or walls and having dark glossy leaf axes Syn|Hyper Pellaea atropurpurea cliff brake, cliff-brake, rock brake any of several small lithophytic ferns of tropical and warm temperate regions |
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