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“大吃一惊”，汉语成语，形容对发生的事感到十分意外。可以翻译为“be startled at；be astounded at；be greatly surprised；get a shock”。
例句：
查尔斯看到他时大吃一惊。
Charles got a shock when he saw him.
队伍蓦然地进了村子， 使居民们大吃一惊。The sudden arrival of the troops in the village came as a great surprise to the inhabitants.