水库 shuǐkù reservoir
How to remember 水库: 水 water + 库 armory = reservoir.
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How it is used
- A reservoir - 修建水库 (xiūjiàn shuǐkù) build a reservoir, 水库蓄水 (shuǐkù xùshuǐ) the reservoir stores water.
- An artificial water-storage lake for irrigation, power, or supply; measure word 座.
- 水 (water) + 库 (storehouse). Contrast 湖 (hú, natural lake).