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There is a layer in it,so it can fill two kinds of drink in it.
And its caps are also separate, so you can decide which drink you want to pour out.
Its layers can satisfy different requirements,and it also has another usage.
For example,one side of the bottle fill black tea,and another fill milk.
You can mix them together when pouring out,then you will get new drink ,milk tea.
Lin Fang Ru ,