名词
中文翻译：主要过滤器
同义词：
['primary filter', 'primary screen', 'primary stage']
例句：
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1.The primary filter in this system is thequality of the raw materials.
这个系统中的主要过滤器是原材料的质量。
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2. During the primary filteringprocess, bacteria are removed from the water.
在初级过滤过程中，细菌从水中被去除。
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3. The primary filter was designed to removeimpurities before the final polishingstep.
初级过滤器的设计是为了在最终抛光步骤之前去除杂质。