(Though in letters to Madeline his writing was an inconsistent scrawl, in his laboratory notes it was precise.) When he was quite sure that Nature was persisting in doing something she ought not to, he went guiltily to Gottlieb, protesting, "The darn’ bugs ought to die in this immune serum, but they don’t.
There are no more uses of "persist" in the book.
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The child persisted in asking questions despite my obvious desire to be left alone.
We expect the conditions to persist into next year.