They need to employ someone with a proven ability to get the job done.
a proven scientific fact
There is an expectation that it will soon become a clinically proven drug.
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probado, probado/da [masculine-feminine, singular]…
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provado…
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kanıtlanmış, ispatlanmış…
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avéré/-ée, qui a fait ses preuves, (é)prouvé…
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dokázaný…
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bevist…
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terbukti…
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ได้รับการพิสูจน์…
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