遗憾的是,他没能通知你关于会议的事。

It is unfortunate that he couldn't inform you about the conference.

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It is unfortunate that he couldn't inform you about the conference.

unfortunate 是由前缀 un-(表示"否定")和形容词 fortunate(幸运的)组成的复合词,字面意思是"不幸运的",引申为"不幸的、遗憾的"。

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