Learn what "this is one" means, when people say it, and how to use it naturally in English.

There are still many things each person does not know about the other.
From Married To A Stranger, Episode 28
Someone reflects on how little the two people know about each other.
Use this when talking about gaps in understanding in a relationship. It is natural in context, but the line is too specific and explanatory for a strong standalone phrase page.
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