名词
中文翻译：粒子坠落同义词
同义词：
['particle fall', 'particle impact', 'particle collision']
例句：
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1. The particles in the air are falling down to the ground.
空气中的粒子正在下落。
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2. The particle fall is a natural process that occurs in many different environments.
粒子坠落是一种自然过程，发生在许多不同的环境中。
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3. The particle fall has been studied extensively in the field of astrophysics.
在天体物理学领域，粒子坠落已被广泛研究。