pendulate

例句：

1. 1.The rope was pendulous enough to cause her to lose her balance.
   绳子足够长，足以让她失去平衡。
2. 2. The swing was pendulous and made a soothing sound.
   秋千摇摆着发出悦耳的声音。
3. 3.The weight of the books caused the shelves to pendulously sway.
   书的重量使书架摇摆不定。