They believe that participating in fights toughens boys and shows them how to be men.他们认为参与打架会使男孩子变得坚强,教会他们怎样成为男人。He thinks boxing is good for kids – that it toughens them up.他认为拳击对小孩子有好处,可以使他们变得更坚强。He thinks boxing is good for kids, that it toughens them up.他认为拳击对小孩子有好处,可使他们变得坚强。The new law toughens up penalties for those that misuse guns.新法对滥用枪支的处罚更为严厉。