他的情绪似乎在兴奋和焦虑之间交替。

His mood seems to alternate between excitement and anxiety.

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His mood seems to alternate between excitement and anxiety.

alternate 是动词,由前缀 alter-(表示"改变")和词根 -nate(表示"进行某种动作")组成,意思是"交替、轮换"。在这里指情绪在两种状态之间来回变化。

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