How to Say "trials" in Spanish
The Spanish word for “trials” is “ensayos” — B2 level.
English → SpanishB2
nounB2formal
scientific or clinical testing

Examples
Los ensayos clínicos de la nueva vacuna fueron un éxito.
The clinical trials of the new vaccine were a success.
Hicimos varios ensayos antes de lograr el resultado final.
We made several attempts before achieving the final result.
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