形容词
中文翻译：Unknown
同义词：
['silent', 'lifeless', 'uninteresting', 'insipid']
例句：
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1. The paintingis so dull that it barely captures the beauty of nature.
这幅画如此单调，几乎捕捉不到大自然的美。
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2.She was so dull that she couldn't even recognize her own reflection in the mirror.
她如此迟钝，以至于连镜子里的自己都认不出来。
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3. The story was so dull that I couldn't keep my eyes open for more than a few minutes.
这个故事太无聊了，我最多只能坚持看几分钟。