1. aquatic plant with deep green foliage useful as an aquarium oxygenator; sometimes placed in genus Egeria. 
   具有深绿色叶子的水生植物，通常被用作一种鱼缸的充氧植物。
2. artificial fumigation for plants 
   植物人工熏气
3. artificial improvement forsoil mass 
   人工土质改良
4. artificial propagation of fish 
   鱼类人工繁殖
5. artificial recharge of groundwater 
   地下水人工补给

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