pendular movement of mediastinum

例句：

1. 1.The pendular movement of the clock's hands is mesmerizing.
   时钟指针的摆动令人着迷。
2. 2. The swinging tree was a symbol of freedom for many people.
   摇摆的树对许多人来说是自由的象征。
3. 3.The pendular movement of the leaves caused the wind to carry the sound of the song.
   树叶的摆动使风带着歌声的声音。