by surprise 
出其不意
- Our cook's sudden announcement that she was leaving took us quite by surprise.
我们的厨师突然说要离去, 这使我们非常惊奇。 - The policeman took the burglar by surprise as he opened the window.
当窃贼开窗子的时候,警察冷不防地捉住了他。 - On a wild night our regiment take the fort by surprise.
在一个狂风暴雨之夜,我团出其不意地攻占了那个要塞。
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