六年级下册英语27页的Did You Know的翻译（人教版）的

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Plants grow all over the world. Some pliants grow on land and some grow in water.Some plants are big like trees and some are so small that we cannot see them with our eyes. The first plant appeared in the ocean 1,500 million years ago.Plant scientists know there are about 270,000 species of higher plants. Smoe of the plants have no flowers and some have no fruits. Without plants,people and animals can't live. We need plants for food. Oxygen comes from plants.And we need to breathe the oxygenevery minute.世界上到处都有植物的生存。有的植物生长在陆地上而有的生长在水中。有的植物大的像树而有的又是那么小，以致我们无法用肉眼看见。最早的植物出现在1500000000年前的海洋里。植物科学家知道大约有270000种高级植物的物种。有的植物没有花，有的植物没有果。没有植物人类和动物就不能生存。我们需要植物作为食物。植物产生氧气。我们每时每刻都需要呼吸氧气。

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