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cell membrane
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【物理】细胞膜
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详细解释：
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以下为句子列表：
英文: Active transport The transport of molecules or ions across a cell membrane against a concentration gradient, with the expenditure of energy, usually in the form of ATP.
中文: 主动运输：伴随着能量的消耗，ATP的产生，逆着浓度梯度的分子或者离子的跨膜运输。
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英文: Ectoplasm The outer gel-like layer of the cytoplasm in the cells of plants and some protoctists, which lies immediately beneath the cell membrane and contains a dense array of microtubules.
中文: 外质：植物及某些原植体细胞内，细胞基质近外方的胶状层，直接位于细胞膜之下，并含有密集排列的微管。
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英文: Facilitated diffusion A passive transport of molecules across a cell membrane along a concentration gradient, mediated by carrier molecules or complexes, usually proteins.
中文: 易化扩散（促进扩散）：分子沿浓度梯度由载体分子或复合物（通常是蛋白质）作为媒介的一种被动跨膜运输。
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英文: In primitive protoctisis, as in animals, the cell membrane ingrows under the control of a ring of actin microfilaments, and a furrow constricts the cell equator until it pinches the cell in two.
中文: 在动物细胞中，胞质由肌动蛋白控制，在赤道面处向下凹沟，形成环状缢缩，最后缢缩断裂，细胞一分为二。
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英文: The molecule structures of cell membrane and muscle cell; The principle of muscle contraction.
中文: 细胞膜和肌细胞的分子结构；肌肉收缩的原理。
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