verb🔗Share变硬，使坚韧。 To make tough."The harsh winter winds toughened my skin. "严冬的寒风让我的皮肤变得坚韧了。conditionqualityChat with AIVocabulary GamePractice Reading
verb🔗Share变得坚强，加强，硬化。 To become tough."Spending a year working on the farm toughened him up. "在农场工作了一年，他变得更坚强了。conditionabilityChat with AIVocabulary GamePractice Reading
