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The thorax and pleon bear a number of lateral appendages, including the gills, and the tail ends with a telson.

另一个古老特征是甲壳亚门动,这样在化石中三叶虫就已经有了。

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greenbottle, greenbrier, greenbug, greenbul, Greene, Greeneian, Greeneland, greener, greenery, green-eyed,

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3G, 401(K), a,

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PBS地球-动物

They had thin, light-weight exoskeletons that helped them move faster, and flattened tails called telsons that gave them extra swimming power.

外骨骼又薄又轻, 可以帮助们更快地移动,而被称为尾平尾巴则赋予们额外游泳能力。

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greenhorn, greenhouse, greenhouse effect, greenhouse gas, Greenian, greenie, greening, greenish, greenish yellow, greenism,

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3G, 401(K), a,
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