Porphyra is one of the most important Marine algae, which has a global distribution and an important economic value.

紫菜是一种重要的经济型红藻，全世界都有广泛的分布，在我国紫菜产值位居海藻之首。

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Some algae cells are also easier to filter than others, reducing the energy and economic cost of "harvesting" the algae from cultures.

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And this is an economic way of just bypassing plants or algae or other forms of energy.

WHITEHOUSE: Press Briefing