尽管会议内容无疑准备得很充分,但还是出现了一些组织问题。

尽管会议内容无疑准备得很充分,但还是出现了一些组织问题。

Although the content of the Conference was unquestionably well prepared, some organizational problems appeared.

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Although the content of the Conference was unquestionably well prepared, some organizational problems appeared.

unquestionably 是由形容词 questionable(有疑问的)加上否定前缀 un-(表示"不")和副词后缀 -ly 构成的副词。questionable 来自名词 question(问题),所以 unquestionably 字面意思是"没有问题地",即"毫无疑问地"。

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