例如，要是你在在嘈杂的咖啡馆里写一封电子邮件或在雨林里搜寻一只伪装的昆虫，能过滤掉外部的刺激就很有用。
It can be useful to filter out external stimuli if you are writing an email in a noisy coffee shop, for example, or are searching for a camouflaged insect in a rainforest.
过滤逻辑包含在一个外部类中，该类可作为本文源代码的一部分下载。
The filtering logic is contained in an external class that can be downloaded as part of the source code for this article.
她避免在尾气排放的环境中行走，不使用杀虫剂，购买有机食物，关闭窗户避免外部污染空气进入，在她房间里用空气过滤器。
She avoids walking through exhaust, doesn't use pesticides, buys organic foods, shuts her Windows to keep air pollution outdoors and USES air filters in her home.
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