Bulgarian translation of
                                                                            toughening
                                                                        is 
                                                                            закаляването 
                                                                    
                                
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                                                    Translate toughening into other languages
- in Albanian toughening
- in Bosnian (Latin) toughening
- in Croatian toughening
- in Macedonian заострување
- in Serbian (Cyrillic) тоугхенинг
- in Slovenian zaostruje
- in Serbian (Latin) toughening