Ballism was defined as "Repetitive, but constantly varying, large amplitude involuntarymovements of the proximal parts of the limbs".
颤搐被定义为“四肢近端重复的，但不断变化的大幅度不自主运动”。
2
Do you ever have involuntary leg movements while you are awake?
在你清醒的时候，你的脚是否有些无意识的动作？
3
Like me, he has a speech impediment and a condition called "essential tremor" that causes involuntary hand movements, which make him look more fragile than he is.