名词短语
中文翻译：自由运行的系统
同义词：
['free-running system', 'free-running loop']
例句：
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1.The free running fit is a popular choice for outdoor activities.
自由运行系统是户外活动的一个流行选择。
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2. In the free running fit, the athletes move around in a circular pattern.
在自由运行系统中，运动员以圆形模式移动。
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3. The free running fit was designed to improve efficiency and reduce energy consumption.
自由运行系统旨在提高效率和减少能源消耗。