形容词
中文翻译：Unknown
同义词：
['blunt', 'sluggish', 'uninteresting']
例句：
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1.The dull light of the room made it difficult to focus on the task.
房间昏暗的光使得难以集中精力完成任务。
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2. His dull performance left everyone indifferent.
他的表现平淡无奇，让所有人都漠不关心。
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3.The dull colors of the painting were hard to appreciate.
这幅画单调的颜色很难让人欣赏。