so the higher the temperature of an object

一个物体的温度越高
the more infrared radiation of a higher wavelength it emits.

它发射的红外线波长越长
If you take a picture of a neighborhood at night

如果你在晚上用红外线照相机拍摄居民区
using an infrared camera you can see how much heat

你就能知道不同的房子
is being emitted from all the different houses.

释放了多少的热量
You can identify ones that don't have enough insulation,

你能判断出哪一家的隔热不良
for example, or ones that are wasting heat

举个例子就是说哪家在浪费热量
because they're emitting it at a higher temperature.

因为他们的房子温度比别人高
These are some examples of using a wavelength

这就是一个利用
that our eye can't detect but getting information from it.

非可见光线获取信息的例子
You also are familiar with ultraviolet radiation,

你们也很熟悉紫外辐射
so these are wavelengths that are shorter than the visible spectrum.

紫外辐射的波长比可见光短