pondweed
[ˈpɑ:ndwi:d]
n.
水池草（泛指多种淡水植物，如眼子菜，鸭子草等）;
例句:
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That oxygenating Canadian pondweed we've all got in the pond?
来自BBC
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Examples include filamentous algae such as Spirogyra, and waterweeds like the Canadian pondweed ( Elodea ).
例如像水绵的丝状藻, 水蕴草,加拿大的眼子菜 ( 伊乐藻属 ) 等.