以下为句子列表：
英文: A balance wheel is a finely balanced disk that rotates fully one way and then the other, repeating the cycle over and over [see illustration on page 81].
中文: 所谓平衡齿轮是一个精细平衡的圆盘，可以正向反向来回旋转摆动（参见〈早期时钟机械原理的发展–4〉）。
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英文: A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.
中文: 游丝在手表或钟内用于调整计时器摇轮运动的细小的卷绕弹簧
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英文: The spinning balance wheel that paces a mechanical watch typically rocks back and forth at about five beats a second.
中文: 而控制机械錶快慢的旋转平衡摆轮每秒通常只能来回五次左右。
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