名词
中文翻译：可变密度过滤器
同义词：
['Variable Density Filter (VDF)', 'Variable Density Separator', 'Variable Density Impactor']
例句：
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1. The variable density filter is used to remove impurities from the air before it enters the engine.
可变密度过滤器用于在进入发动机之前去除空气中的杂质。
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2. In this process, the variable density filter is crucial for maintaining the cleanliness of the exhaust gases.
在这一过程中，可变密度过滤器对于保持废气的清洁至关重要。
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3. The variable density filter helps to reduce the amount of pollutants in the exhaust gases, which can improve the efficiency of the engine.
可变密度过滤器有助于减少废气中的污染物含量，从而提高发动机的效率。