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.
这是个很有用的功能，因为安装时，可能并不总有足够的空间让舷外发动机向它们的固定点倾斜。
This is a beneficial function because the mounting does not always provide enough room for all outboards to be tilted forward on their own mounts.
对大多数人来说，燃气轮机是一个巨大的圆柱体型的东西，安装在商用飞机上，其实它们也被广泛应用在固定的发电设备中。
To most people a gas turbine engine is the huge cylinder bolted beneath the wing of a commercial airliner, although they are also widely used in stationary power plants.
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