核心问题
flat 用作副词时与 flatly 有什么区别？
词典解答
flatly 的词义和用法较少,通常作“断然地”“低沉地”“没精打采地”解:
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She flatly refused to give us any information. 她直截了当地拒绝向我们提供任何情报。
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He flatly denied that he saw what had happened. 他矢口否认他看到过事情发生的情况。
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I thought the pianist played rather flatly (= without any emotion or interest). 我觉得那位钢琴家演奏得相当平淡乏味。
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“It’s hopeless,” he said flatly. “没希望了，”他声音低沉地说。
而副词 flat 的词义和用法较多：“平直地”“完全地”“坚决地”“低调地”“正好”“整整”：
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He fell flat on his face in the mud. 他脸朝下扑倒在泥沼里。
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When I asked him for a favor, he turned me down flat. (DCAE) 我求他帮我一个忙时，他断然拒绝了我。
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She sang flat throughout the song (= all the notes she sang were too low). (CIDE) 整首歌的音调她都唱得太低了。
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I got dressed in three minutes flat. (LDCE) 我穿好衣服只用了三分钟。
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I can change a tyre in 2 minutes flat. (ALD) 我只用两分钟就能换上一个轮胎。