témoin

In a sentence

• Le témoin a raconté ce qu'il avait vu lors de l'accident.

  The witness explained what they had seen during the accident.

  Here, 'témoin' refers to 'witness' as a person who has seen an event and provides testimony about it.

• Elle a utilisé un témoin pour tester la température du four.

  She used a test subject to check the oven's temperature.

  In this context, 'témoin' refers to a test item or a subject used in experiments or tests.

• Ce vieil immeuble est un témoin du passé de cette ville.

  This old building is a testament to the city's past.

  Here, 'témoin' metaphorically acts as 'testament' or 'evidence' symbolizing historical significance.