If this distance is large in comparison to the wavelength, this dam simply casts a shadow.
如果这个距离,比波长更长,水槽中的屏障就会投下阴影。
For example, you could put a dam in the middle of the tank.
举个例子,在水槽中间放个屏障。
Remember these water tanks where you could put a vibrator in a water tank.
想起那些,里面盛有振动器的水槽了吗。
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