pendulums

例句:

• An alternative approach using pendulums and dashpots is often used.
  叠代法中往往使用单摆和冲击板.
  
• Good clocks have pendulums which are automatically compensated for temperature changes.
  好钟的钟摆可以自动补偿温度变化.
  
• The pendulums of the clocks in their cottages are the same, a bear!
  他们房里钟摆是一样的, 一只小熊!