Your picture is so fine that my observation cannot detract from it, and, besides, it is only my personal opinion.
That’s a great thing," Sergey Ivanovitch said to himself, feeling at the same time that this consideration had not the slightest importance for him personally, but would only perhaps detract from his romantic character in the eyes of others.
There are no more uses of "detract" in the book.
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I think she’s made a good case. I can neither add to it nor detract from it.