形容词
中文翻译：Unknown
同义词：
['uninteresting', 'unexciting', 'lackluster']
例句：
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1. The painting is so dull that it barely looks like anything.
这幅画太单调了，几乎看不出是什么东西。
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2. She found the conversation to be quite dull.
她觉得对话很单调。
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3. The old book was filled with dull facts and figures.
那本旧书充满了枯燥的事实和数字。