impregnable

adj.

攻不破的，坚不可摧的；无可辩驳；毫不动摇；

1. They will establish impregnable fortresses.
   他们将建造坚不可摧的城堡。
2. The lofty walls of the castle seemed impregnable.
   这座城堡的高墙似乎坚不可摧。
3. The lawyer won his case with an impregnable argument.
   律师以无可辩驳的论据打赢了那场官司。
4. Only in this way can you be in an impregnable position for good.
   也只有这样，你才能永远立于不败之地。

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