water glass

water-glass的词性：
n.（名词）

1. A drinking glass or goblet.
玻璃杯：水杯或高脚杯

2. An open tube or box having a glass bottom for making observations below the surface of the water.
玻璃筒镜：有玻璃底的开管儿或箱，用于水面下观察

3. See sodium silicate
参见 sodium silicate

4. A water gauge made of glass.
水位表：玻璃制的水位表

5. See clepsydra
参见 clepsydra