secondary filter的用法和樣例：
例句
- The flow field around the secondary filter was vividly characterized with a porous medium model, so that the flow pattern around this kind of filter was readily obtained.
多孔介質模型形象地描繪出了二次濾網的內部流場，獲得了該型號濾網的內部流動規律。 - By replacing your air filter annually, or biannually if you live in a dusty area, you'll ensure the engine can breathe freely.
每年換一次過濾器或者在沙塵多的地方每半年更換一次能保證你的愛車引擎自由呼吸。
