名词
中文翻译：Unknown
同义词：
['shadow', 'shade', 'darkening']
例句：
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1. The artist used a dark shade of blue to create the painting.
这位艺术家使用深蓝色来创作这幅画。
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2. The trees cast dark shadows on the ground during the night.
树木在夜晚投下黑暗的影子。
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3. The darkening sky signaled that it was getting late.
天色渐暗，意味着时间不早了。