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vacuum flask invented in Westerm, But it popular in Oriental. When we use it we can hardly see the water line. Especially old people.
This design like a buoy. There is a hook in the top of this object. When water is going to full.this buoy will float. You can easily find the water line. Also Carbon in inside. So the water will be more clean.
Bo YU, XiaoxXiao, Zichuan Chen,Xu Lu