形容词
中文翻译：Unknown
同义词：
['pale', 'translucent', 'hazy', 'veil-like']
例句：
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1.The sun was shining through the penumbral mist.
阳光透过半透明的薄雾。
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2.The painting had a penumbral quality to it.
这幅画有一种半透明的感觉。
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3. The fog was so thick that it was almost penumbral.
雾太厚了，几乎成了半透明状态。