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1. The hydrometric pendulum is sometimes used to determine flow velocities in open channels.
   测流速的摆锤有时用于确定明渠中的流速。
2. Huygens saw that a pendulum traversing a circular arc completed small oscillations faster than large ones.
   惠更斯观察到，若摆锤沿著圆弧摆荡，那麽摆动幅度小的时候会比幅度大时振荡得快。