名词中文翻译
中文翻译：超细粒
同义词：
['ultrafine', 'ultra-fine', 'ultra-micro', 'ultra-small']
例句：
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1. The fine grains of sand were so fine that they could be seen through the glass.
沙子的颗粒非常细小，以至于透过玻璃都能看见。
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2.The engineer used ultra-fine grains to make the machine run more smoothly.
工程师使用超细粒材料使机器运行得更加顺畅。
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3. Ultra-fine grains are often used in cosmetics to improve skin texture.
超细粒常用于化妆品中，以改善皮肤质地。