以下为句子列表：
英文: By keeping this center of mass closer to the rotor disc the pendulum effect is reduced and the helicopter is markedly more stable.
中文: 靠着这种质心接近转子盘钟摆效应,减少了直升机着较为稳定.
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英文: This short-arc coupled with the low pendulum effect achieved by pivoting the disc through a point near its center of gravity assures rapid closure.
中文: 绕轴旋转的阀瓣的重力中心距轴心较短，因此这种短弧的钟摆效应也比较小，从而确保能够迅速关闭。
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