impregnable
美 [ɪmˈpreɡnəb(ə)l]英 [ɪm'preɡnəb(ə)l]
- adj.坚不可摧的;牢不可破的;不可战胜的;难以改变的
- 网络攻不破的;可浸透的;坚固的

Adj.+n.
impregnable
1.坚不可摧的;牢不可破的animpregnable building is so strongly built that it cannot be entered by force
2.不可战胜的;难以改变的strong and impossible to defeat or change
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