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单词	impregnable
释义	im·preg·na·ble 1 (ĭm-prĕgnə-bəl) adj. 1. Impossible to capture or enter by force: an impregnable fortress. 2. Difficult or impossible to attack, challenge, or refute with success: an impregnable argument. [Middle English imprenable, from Old French : in-, not (from Latin in-; see IN-1) + prenable, pregnauble, pregnable; see PREGNABLE.] im·pregna·bly adv.
随便看	ethology ethos ethoxy ethoxyl ethyl ethyl acetate ethyl alcohol ethylamine ethylate ethylation ethyl carbamate ethyl chloride ethylene ethylene glycol ethylenic ethyl ether ethylic ethyl mercaptan ethyne ethynodiol diacetate -etic etic e-ticket etiolate etiolation

英语词典包含135693条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。