“任意地”的英语可以翻译为：[法] at random，arbitrarily，discretionarily ...

增加的速度任意地四散传播.An increased velocity is randomly dispersed.他任意地[随心所欲地]对事实加以渲染.He embroidered the facts with considerable license.守卫们组对各自散开, 任意地随机抽查.The guards pair off in all directions, making their choices at random....