**副词 (adv.)**：令人惊讶地；出奇地。用来强调某事超出预期，令人感到震惊或难以置信。
/əˈstɒnɪʃɪŋli/ (英式) /əˈstɑːnɪʃɪŋli/ (美式)
Astonishingly, she finished the marathon in under three hours.
令人惊讶的是，她在不到三个小时内跑完了马拉松。
The old building had been astonishingly well preserved despite decades of neglect, and visitors often remarked that it looked as if it had been built only yesterday.
尽管几十年来无人维护，这座老建筑保存得出奇地完好，参观者常常感叹它看起来就像昨天才建成的一样。
该词源于动词 astonish，而 astonish 可追溯至古法语 estoner（使震惊），更早来自通俗拉丁语 extonāre，由 **ex-**（出）和 tonāre（打雷）组成，字面意思是"像被雷击一样"。后加上 -ing 构成形容词 astonishing，再加 -ly 构成副词，表示"以令人震惊的方式"。
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