http://www.pons.de/produkte/3-12-517841-X/（牛津大学出版社授权产品）
英语
西班牙语
impregnable [美 ɪmˈprɛɡnəb(ə)l, 英 ɪmˈprɛɡnəb(ə)l] 形
1. impregnable:
- impregnable rampart/fortress
-
- impregnable rampart/fortress
-
- impregnable barrier/organization
-
西班牙语
英语
-
- impregnable
- inconquistable fortaleza
- impregnable
- impenetrable fortaleza
- impregnable
- irreductible fortaleza
- impregnable
在《PONS词典》中的词汇
英语
西班牙语
impregnable [ɪmˈpregnəbl] 形
1. impregnable (unable to be taken):
- impregnable
-
2. impregnable 英, 澳 (undefeatable):
- impregnable
-
西班牙语
英语
-
- impregnable
在《PONS词典》中的词汇
impregnable [ɪm·ˈpreg·nə·bəl] 形
1. impregnable (unable to be taken):
- impregnable
-
2. impregnable (undefeatable):
- impregnable
-
无例句可用
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单语范例（未经PONS编辑处理）
That wall must be kept high and impregnable.
en.wikipedia.org It was on impregnable ground, and was guarded well.
en.wikipedia.org The fort thus earned a reputation for being impregnable.
en.wikipedia.org While it was an effective defensive position, it was not an impregnable one.
en.wikipedia.org This line was popularly thought to have been an impregnable defensive chain.
en.wikipedia.org