与使用末端质量的传统系统相比，压电弯曲件可在更宽的频带上操作。
The piezo flexure also operates over a much wider frequency bandwidth than conventional systems incorporating a tip mass.
末端质量大于0.02公斤（0.04磅）的玩具上的绳在以80转每分钟的速度旋转时长度应小于50厘米（20英寸）。
Toys with an end mass greater than 0.02 kg (0.04 lb) shall have cord length less than 50 cm (20 in. ) measured when rotating at 80 r/min.
末端的物体，它质量和周期无关，是大概15公斤。
And the mass at the end of it, which doesn't enter into the period, is about 15 kilograms.
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