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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物分足,足在化石中三叶虫就已经有了。

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accusable, accusal, accusant, accusation, accusatival, accusative, accusatorial, accusatory, accuse, accused,

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3G, 401(K), a,

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PBS地球-动物趣闻

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

的外骨骼又薄又轻, 可更快地移动,而被称为尾节的扁平尾巴则赋予额外的游泳能力。

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ACD, ACDA, ACDS, ACDSee, ace, acebrochol, acebutolol, acecarbromal, aceclidine, acecoline,

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3G, 401(K), a,
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