| 摘要 |
An apparatus such as a humidifier comprises a water storage tank having an externally exposed surface made of a transparent material and its bottom surface is made partially or totally of a transparent plate. A light source is disposed underneath this transparent plate and there is placed inside the tank a structure having surfaces for reflecting or refracting light from this source to the aforementioned externally exposed surface so that the water level inside the tank is easily visible.
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