为什么日本的空气净化器，滤�的更换年限是十年，而中国普遍是半年到一年？ 知乎 Sketch Coloring Page

为什么日本的空气净化器，滤�的更换年限是十年，而中国普遍是半年到一年？ 知乎 Template

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sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )

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sketch #3260 sorry to over comment on your blog .haha. I 'm just flnpiipg through your posts after finding you through the KCWC. Recently I had this huge urge to learn to sketch with black ink pens. This cloud drawing is exactly the thing that I feel the need to put on paper. : )

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