From scum on ponds to water celery on river beds and reeds swaying in a wetland breeze, freshwater algae and plants provide oxygen to breathe and food to eat.

从池塘的浮垢到河床上的水芹和沼泽地上随风摇摆的芦苇，这些淡水藻类和植物为生物提供呼吸的氧气和可吃的食物。

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Add the water, celery, onion, and pepper, cover, and turn the heat on high.

NPR: Recipes: 'The Summer Shack Cookbook'

That's not to say that celery sticks - along with other high fibre, water-heavy fruits and vegetables - have no value as weight-loss aids.

BBC: Who, Why, What: Can foods have negative calories?

Consider celery, often proposed as a negative-calorie food due to its low-calorie count, high water density, and impressive fibre content.

BBC: Who, Why, What: Can foods have negative calories?