名词
中文翻译：筛分
同义词：
['sort', 'sieve', 'filter']
例句：
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1.The grain must be sifted through a sieve to remove the impurities.
谷物必须通过筛子去除杂质。
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2.The scientist used a sieve to separate the gold from the other metals.
科学家使用筛子将金与其他金属分离。
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3. The farmers sift through the soil to find the best seeds for their crops.
农民们筛土以找到最适合他们作物的种子。