slave pendulum

例句：

1. 1. The slave pendulumwas used to measure the time in ancientEgypt.
   奴隶钟摆被用来测量古埃及的时间。
2. 2. The slave pendulumwas a symbol of slavery in many cultures.
   奴隶钟摆是许多文化中奴隶制的象征。
3. 3. The slave pendulumwas used as a means of entertainment duringthe Middle Ages.
   奴隶钟摆在中世纪作为一种娱乐方式。