以下为句子列表：
英文: 2Intermittent User.No real communication is possible except for the most basic information using isolated words or short formulae in familiar situations and to meet immediate needs.Has great difficulty understanding spoken and written English.
中文: 只属于偶尔使用英语，除非在熟悉的情况，使用单词和简短的短句表达最基本的信息，在说写方面有重大的障碍。
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英文: A 49-year-old female presented with cough and intermittent breathlessness for one week.
中文: 摘要一位49岁的女性病患主诉咳嗽、呼吸困难，持续约一周左右。
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英文: A hydrokinetically simulated sucking was made to study the self-intermittent vacuum drainage of the root canal.
中文: 摘要作者采用实验力学方法，模拟吸吮，探讨自体间断真空度根管引流术的流体力学原理。
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英文: An optimized design method of the ratcher mechanism in the multi-step belt conveyer with intermittent movement is presented. A practical design example is given.
中文: 摘要提出了一种多步距间歇运动的带式输送机棘轮机构的优化设计方法，并给出了设计实例。
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英文: And because the power system must continuously match electricity consumption with generation, it cannot easily accept a large increase in the unpredictable and intermittent power produced from renewable wind, ocean and solar resources.
中文: 同时由于电力系统必须持续依据电力消耗量调配生产量，因此很难大量采用风力、海洋和太阳能等难以预测的间歇性再生能源。
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