It moves involuntarily without me wanting it to.

它在我不希望的情况下不由自主地移动。

Your arms or your hands might begin to move involuntarily.

您的手臂或手可能会开始不由自主地移动。

Often when you're jittery, your hands shake a little or your body moves a little, almost involuntarily.

通常，当你紧张不安时， 你的手会稍微颤抖， 或者你的身体会稍微移动，几乎是不由自主地。

Treena was blowing on her hands, her feet moving involuntarily up and down, as if marching on the spot.

特蕾娜在她的手上吹着气， 她的脚不由自主地上下移动，好像在原地行进。

A person who " shivers" is someone who is very cold, usually, whose body is beginning to move involuntarily – even though you don't want it to move, it begins to move because you are so cold.

一个“发抖” 的人通常是非常冷的人，他的身体开始不由自主地移动——即使你不希望它移动， 它也开始移动是因为你太冷了。