单词学习：irretrievable 形容词
irretrievable
/ˌɪrɪˈtriːvəbl/
adj. 无法挽回的；不能恢复的；不可弥补的
The loss of that ancient manuscript was an irretrievable blow to historical research, as Professor Gu often lamented.
正如顾老师经常感叹的那样，那份古代手稿的丢失对历史研究是一个无法挽回的打击。
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