以下为句子列表：
英文: A supportive tissue of plants, consisting of elongated, living cells with unevenly thickened walls.
中文: 厚角组织植物的一种支持组织，由延长的活细胞组成，细胞壁厚薄不均
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英文: According to the conventional hypothesis, the earliest living cells emerged as a result of chemical evolution on our planet billions of years ago in a process called abiogenesis.
中文: 根据传统的假说，最初的活细胞，肇生于数十亿年前地球上的化学演化过程，这种说法称为无生源说。
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英文: All living cells send out tiny pulses of electricity.
中文: 所有生物细胞都会发出微小的电脉冲。
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英文: Also known as the sea wasp, this salad-bowl sized jellyfish can have up to 60 tentacles each 15 feet long. Each tentacle has 5,000 stinging cells and enough toxin to kill 60 humans.
中文: 绰号海洋中的黄蜂，咸水碗状水母有60条15英尺长的触须，每条触须上有5000个毒刺细胞，足够杀死60个人。
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英文: Animals were prevented from evolving wheels, the biologists reasoned, by the following dilemma: living cells in an animal's body are connected to the heart by blood vessels, and to the brain by nerves.
中文: 生物学家们推论，动物没有进化出轮子是由下述困难所致：动物身上的活细胞通过血管与心脏相连，通过神经与大脑相连。
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