It's a phenomenon that occurs anywhere you have a large lake that doesn't freeze and have cold air flowing over it, mostly in the Northern Hemisphere Like the great lakes in the United States.
这种现象发生在不结冰的大湖泊附近，这些湖通常被冷空气包围着，并且它们大多数坐落在北半球，就像美国的五大湖一样。
Blue-green algae is a form of aquatic plant that occurs naturally in rivers and lakes.
蓝藻是一种形式的水生植物出现在自然河流和湖泊。
Blue-green algae is a form of aquatic plant that occurs naturally in rivers and lakes.
蓝藻是一种形式的水生植物出现在自然河流和湖泊。
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