现在在观心亭里，我们用滤纸过滤液体，就要得到我们珍贵的靛蓝染料了！
Now we are slowly draining this liquid through filter paper in the pavilion and we almost have our precious indigo pigment.
安德里亚的一个优点是，它不需要一次性过滤纸。
An advantage of Andrea is that it requires no disposable filters.
咖啡通过这张特殊的滤纸得到过滤。
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