地下水 dìxiàshuǐ groundwater
How to remember 地下水: 地 ground + 下 down + 水 water = groundwater.
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How it is used
- Groundwater - 地下水位 (dìxiàshuǐ wèi) the water table; 开采地下水 (kāicǎi dìxiàshuǐ) extract groundwater.
- A hydrology/environmental term for water beneath the surface. Neutral/technical.