Ancient fresh water green algae must have evolved features that enable them to withstand extremes of temperature and periods of dryness.

古老的淡水绿藻一定进化出了一些特性，这些特性使得它们能够熬过极端的温度和干旱期。

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If you're in a coastal region, it pays to do a bit of homework on the cleanliness of the local fresh and ocean water supplies; algae blooms or cholera outbreaks will be widely reported.

如果你在沿海地区，你就要对当地的事物有所了解，如干净新鲜的海产品、水藻，以及广泛报道的霍乱疫情。

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Algae are an attractive way to harvest solar energy because they reproduce themselves, they can live in areas not useful for producing food and they do not need clean or even fresh water.

藻类由于能自行再生，是采攫太阳能的一种很有吸引力的方法，它们可以生长在无利于生产粮食的地方，不需要清水甚至淡水。

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