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The phrase "are a sure precursor" is correct and usable in written English.
It can be used to indicate that something is a reliable indicator or sign of what is to come.
Example: "The sudden drop in temperature and the darkening clouds are a sure precursor to the storm that is approaching."
Alternatives: "are a definite sign" or "are a clear indication".
Exact(1)
Frost heaves, the technical name for roads that go bump in the night, are a sure precursor of spring.
Similar(59)
"Occupying the centre ground is no guarantee of electoral success, but vacating it is a sure precursor of failure.
That seemed like a sure precursor to a true streaming service, but labels were reportedly reluctant to go all-in on that model originally.
These signs are a precursor to a more fundamental shift.
I say that he was a precursor of idealists; a precursor of socialists".
The Austrian Elssler was a Gaga precursor.
"It was a fabulous precursor," he said.
A cardioblast is a cardiac precursor cell.
The thesis is a clear precursor of the final article.
Loss of a job was a primary precursor to a spell of $2-a-day 2-a-day.
OAS is a direct precursor of cysteine.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com