| 词汇 | alga |
| 词源 | alga. Snow in Arctic and Alpine regions that appears red has often been regarded as a supernatural portent of evil. It is ac- tually caused by the presence of large numbers of the minute alga Protococcus nivalis. Alga, from the Latin alga, “seaweed,” are simple microscopic flowerless plants, ranging from those that coat ponds with green scum to giant seaweeds 100 feet long. |
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