传统的空气污染监测仪通常安装在灯柱上，并被固定在距离地面约九英尺的空中。
Conventional air pollution monitors are normally fixed on lampposts at about nine feet in the air.
在他去世的两个月前，报纸报道称他正在研究“死亡射线”，并“用一个复杂的装置在三英尺外杀死了一只老鼠”。
Two months before he died, newspapers were reporting that he was working on a "death ray," and that he had "killed a rat with an intricate device at a distance of three feet".
帕洛阿尔托市的一位居民让她的木屐树篱长到两英尺以上，并因此被捕。
A Palo Alto city resident allowed her xylosma hedge to grow above two feet and was arrested for it.
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