他最新的书无疑是他迄今为止最好的作品。

His latest book is undoubtedly his best work yet.

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His latest book is undoubtedly his best work yet.

undoubtedly 由前缀 un-(表示“不”)和动词 doubt(怀疑)加上后缀 -ed(构成形容词)和 -ly(构成副词)组成,字面意思是“不可怀疑地”,即“毫无疑问地、肯定地”。

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