| 单词 | impregnable |
| 释义 | impregnable 1. adj. 1. (of a fortified position) that cannot be taken by force. 2. resistant to attack or criticism. Derivatives impregnability n. impregnably adv. Etymology: ME f. OF imprenable (as IN-(1), prendre take) 2. adj. that can be impregnated. |
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