all work and no play makes jack a dull boy中dull是什么意思

all work and no play makes Jack a dull boy. All work and no play makes Jack a dull boy All work and no play makes Jack a dull boy.中为什么用JACK? All work,no play,makes Jack a dull boy 翻译all work,no play makes Jack a dull boy 英语翻译all work and no play makes Jack a dull boy all work and AII work and no play makes Jack a dull boy work 还可数?work,还可数?All work and no play makes Jack a dull boy 谚语All work and no play makes Jack a dull All work and no play makes Jack a dull boy里的Jack什么意思? 英语翻译All work and no play makes jack a dull boy.All of us nee all work and no play makes jake a dull boy