adj.非自愿的；无意的；不由自主的
All of the involuntary human subject research incorporates torture. 所有的非自愿的人类对象的研究都归入折磨。
These verbs mean to manifest involuntary vibratory movement. 这些动词意味着显示出不由自主的振动。
It's an almost involuntary thing and it also tells the person seeing this that he is sick. 这几乎是不由自主的动作，而且也告诉看到这些的人们，这个人病了。
