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.
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。
Twenty-four black-aproned judges were wielding their distinctive tasting spoons at the Cup of Excellence competition, searching for the country's best coffee.
24个穿着黑色围裙的评委举着别致的品尝匙，寻找本国最棒的咖啡。
Twenty-four black-aproned judges were wielding their distinctive tasting spoons at the Cup of Excellence competition, searching for the country's best coffee.
24个穿着黑色围裙的评委举着别致的品尝匙，寻找本国最棒的咖啡。
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