以下为句子列表：
英文: Motile organisms may also be negatively chemotactic, swimming away from concentrations of toxic chemicals.
中文: 可以游动的生物体也有负向的趋化现象，总是远离有害的化学物质。
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英文: The spermatozoids of primitive plants are often positively chemotactic, swimming toward the female organs in response to a chemical secreted by the latter.
中文: 较原始的植物的游动精子有正向的趋化现象，总是游向由雌性器官所分泌的物质。
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