• They were constantly on the alert not to be taken by surprise.

    他们一直处于常备不懈状态以防突然袭击。

    《新英汉大辞典》

  • They were constantly on the alert not to be taken by surprise.

    他们一直处于常备不懈状态以防突然袭击。

    《新英汉大辞典》

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