dynamic metamor-phism of coal

例句：

1. 1. The transformation of the ecosystem is a complex process.
   生态系统的变化是一个复杂的过程。
2. 2.Metamorphosis is the process by which an insect transforms into another type of insect.
   变态是指昆虫从一种类型变为另一种类型的过程。
3. 3. The metamorphosis of the butterfly from caterpillar to adult is a fascinating transformation.
   蝴蝶从毛虫变成成虫的过程是一次令人着迷的变态。