他们不知道这个变化是怎么产生的的翻译：They do not know how to produce this change is 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

They do not know how this change is produced

They do not know how to produce this change is

They did not know how this change is produces

They did not know that this change is how the

They do not know how to produce this change is