Because of the physics of diffusion it doesn't go linearly with distance.

由于扩散现象的物理特性,它和距离不是线性相关的

耶鲁公开课 - 生物医学工程探索课程节选

The force may taper off, the force may not be given by a straight line, but for modest deformations, every spring will have a linear regime in which the force is linearly proportional to the stretching.

它产生的力可能会渐渐消失,力的曲线可能不是一条直线,而有轻微的弯曲,每个弹簧都有一个线性区间,在这一区间内,力和伸长量是线性关系

耶鲁公开课 - 基础物理课程节选

It grows as b. The 3 doesn't matter, it's just a constant, it's growing linearly.

它按b来增长，3只是个常量，3没有作用，答案是线性增长的。

麻省理工公开课 - 计算机科学及编程导论课程节选