罗茜的老师对她知识的广度印象深刻。

Rosie's teacher was impressed by the extent of her knowledge.

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Rosie's teacher was impressed by the extent of her knowledge.

extent 是名词,来自动词 extend(延伸、扩展),本义是"范围、程度",在这里特指知识的"广度"或"覆盖面"。

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