lobulation

例句：

1. 1. The balloon was expanding rapidly as it rose higher.
   随着气球升得更高，它正在迅速膨胀。
2. 2.The scientist discovered that the gas inside the container had begun to lobulate.
   科学家发现容器内的气体已经开始膨胀。
3. 3. The car's engine is experiencing a slight lobulation due to overheating.
   由于过热，汽车的引擎出现了轻微的膨胀。