一个镜头的基础定义是其焦距，图4图示出镜头焦距，视野，感应器大小，和工作距离间之关系。
A lens is primarily defined by its focal length. Figure 4 illustrates the relationship between the focal length of the lens, field of view, sensor size, and working distance.
如果你知道视野FOV，感应器大小，和工作距离，你能用以下之方程序去计算你所需之镜头的焦距。
If you know the FOV, sensor size, and working distance, you can compute the focal length of the lens you need using the following formula.
新型的交通工具有双深度或双阶段的司机和乘客气囊和重量感应器，根据乘员的大小、安全带的应用和座椅位置来改变气囊的力量。
Newer vehicles have dual-depth or dual-stage driver and passenger airbags and weight sensors that change the force of the airbag depending on occupant size, seat belt use and seat placement.
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