DrinkSomeone at gatherings where alcohol is served

When drinking at a gathering, I want to know what it is, so I am not taking in something of unknown origin.

Khi uống ở một buổi gặp, tôi muốn biết mình đang uống thứ gì, để không nạp vào một thứ không rõ nguồn.

Job context

Who
Someone drinking at gatherings
When
When a glass is poured
Trigger
An unlabelled bottle arriving at the table
Situation
Drink is poured from a shared bottle rather than from a labelled glass
Constraints
Asking about provenance at the table is impolite

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