Metal can also be a problem, because it’s really good at reflecting electromagnetic waves.

金属也可能是个问题，因为它非常擅长反射电磁波。

By making clicking sounds with his tongue he could sense the objects around him through the reflecting sound waves that bounced back off of them.

通过用舌头发出咔嗒声，他可以通过从物体反弹回来的反射声波来感知周围的物体。