Usages of по одной
На ужин нам принесли по одной порции рыбы, а потом официантка спросила, нужен ли гарнир.
For dinner, they brought us one portion of fish each, and then the waitress asked whether we wanted a side dish.
На полдник бабушка дала детям по одной ватрушке.
For an afternoon snack, Grandma gave the children one cheese bun each.
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