名词
中文翻译：顶部筛网
同义词：
['top filter', 'top sieve', 'topscreen']
例句：
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1. Thetop sieve is used to separate thefiner particles from the coarse ones.
顶部筛网用于将更细的颗粒与粗颗粒分离。
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2. The engineer used the topsieve to remove impurities fromthe water.
工程师使用顶部筛网从水中去除杂质。
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3. The top sieve was designedto catch small insects before they could escape.
顶部筛网设计用来捕捉小昆虫，防止它们逃脱。