A dumbbell was at first literally a dumb bell , which is one that couldn 't ring , one that had no voice .
哑铃最开始写成哑的铃(dumbbell分开写,不是一个词),指不会响、没声音的钟。
Peter harvey the teacher who was given a community order after beating a 14-year-old pupil with a dumbbell warned last year that " lots of teachers are ticking time bombs " because of stress in schools .
The nice thing about weight training is that anything with weight will work -- a dumbbell , a full water bottle or a sock full of sand ...... your body doesn 't know the difference .