From English - German Ding/FreeDict dictionary ver. 1.9-fd1: strengthens /stɹˈɛŋθənz/ bestärkt, stärkt, verstärkt see: strengthen, strengthening, strengthened, strengthened
strengthens /stɹˈɛŋθənz/ bestärkt, stärkt, verstärkt see: strengthen, strengthening, strengthened, strengthened