形容词
中文翻译：单调的
同义词：
['boring', 'tedious', 'monotonous']
例句：
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1. The painting is so dull that it barely catches my attention.
这幅画如此单调，几乎无法引起我的注意。
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2. The music was so dull that I couldn't even enjoy it.
那音乐太单调了，我甚至都无法享受它。
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3. The movie was so dull that I couldn't keep myself awake.
那部电影太单调了，我甚至都无法让自己保持清醒。