they have tested
Present perfect they conjugation of test.

test

The extruder they acquired was originally producing traditional plastic pellets, but they have tested that it could equally produce biodegradable polymers.
L'extrudeuse qu'ils ont acquise produisait à l'origine des granulés de plastique traditionnels, mais ils ont testé qu'elle pouvait également produire des polymères biodégradables.
Many people still do think about the consequences, but unfortunately they start too late, namely when a doctor or social worker tells them they have tested positive.
Beaucoup de personnes pensent effectivement aux conséquences, mais malheureusement trop tard, lorsque le médecin ou le travailleur social leur annonce leur séropositivité.
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