工厂里的空气经过过滤去除杂质。

The air in the factory is filtered to remove impurities.

《柯林斯英汉双解大词典》

也许孩子的心是一只奇妙的漏斗，它滤去纷繁，留取单纯； 滤去凝重，留存梦幻。

Perhaps the child's heart is like a wonderful funnel, which leaches numerous and complicated, keeps and fetches simplicity, filters heaviness and retains illusion.

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诸如img和a的标签可以比较方便的清理，但是一些更强大的标签如object和embed需要被完全得滤去。

Tags like img and a can easily be sanitized, but more powerful tags like object and embed need to be removed completely.

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