形容词
中文翻译：不可观察的
同义词：
['invisible', 'imperceptible', 'undetectable']
例句：
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1. The scientist discovereda new type of matter that is completely unobservable to the naked eye.
科学家发现了一种完全肉眼无法观察到的新物质。
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2. The physicist was able to prove the theory of relativity, which is considered an unobservable phenomenon.
物理学家证明了相对论理论，这是一个被认为是不可观测的现象。
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3. Due to the extreme conditions in space, many physical phenomena are unobservable by human eyes.
由于太空中极端的条件，许多物理现象是无法用人类眼睛看到的。