以下为句子列表：
英文: In pearls, the nacreous layers are generally translucent and composed completely of aragonite, whereas layers without pearly luster are opaque and composed of aragonites and/or vaterites with their relative concentrations different in different pearls.
中文: 其中具珍珠光泽的珍珠层一般呈半透明状，均爲文石组成；无珍珠光泽的不透明层有时由文石组成，有时由六方碳钙石组成。
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英文: Nacreous aspiration ended up as a unstoppable flaw.
中文: 彩虹班的愿望成了呼啸的狂风。
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英文: Nacreous clouds form when the fading light at sunset passes through tiny ice crystals blown along by a strong jet of stratospheric air.
中文: 珍珠云是由于日出时的太阳光穿过被一股强气流吹起的冰晶体时形成的。
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英文: Nacreous clouds—also known as polar stratospheric clouds—contribute to the formation of the polar ozone holes.
中文: 珍珠云，也称为极地平流云，会造南极臭氧空洞的形成。
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英文: Renae Baker, a scientist with the Australian Bureau of Meteorology, snapped this picture of a rare nacreous cloud on July 25 at the country's Antarctic Mawson station.
中文: 雷纳·贝克是澳洲气象署的一位科学家。他在7.25日拍下了这张罕见的珍珠光泽的片。
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