They have shorter or longer wavelengths than visible light .

他们较可见光有或长或短的波长。

These have long wavelengths and therefore bounce only off large things .

无线电波的波长较长，因此只有大物件可以反射它们。

They wouldn 't reflect any wavelengths , so they 'd appear black .

结果就是不反射任何波长的光，也就表现出黑色。

In 2008 , researchers built a microwave cloak that works over a range of wavelengths .

2008年，研究员构建了可工作于一定波长范围的微波隐身器件。

There is no complicated chemistry here , no harnessing of invisible wavelengths .

这其中没有复杂的化学过程，不需要利用看不见的波长。