The boy jittered in his seat when his teacher called on him .

当老师叫到小男孩的名字时，他在座位上胆颤心惊。

Each fly neuron 's response to constant light jittered up and down from one milli second to the next .

每个丽蝇神经元对恒定光线的反应每一毫秒都有一个起伏。