toughen

This activity improves flexibility, and strengthens and toughens muscles.
Cela permet d’améliorer notre souplesse, de raffermir et d’endurcir nos muscles.
Toughens the layer of wax considerably prolonging its duration.
Il durcit la couche de cire en prolongeant remarquablement sa durée.
Well, maybe you should have a lesson that toughens 'em up.
Hé bien, peut-être devrais-tu faire une leçon pour les endurcir.
Supplementing with liquid silica toughens plants cell walls and makes them less susceptible to threats.
Rajouter du liquide à silice permet de renforcer les murs de cellules des plantes et ainsi les rendre moins sujettes aux menaces.
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