如何保护环境已成为世界最大难题之一的翻译：How to protect the environment has become the world's greatest mystery 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

How to protect the environment has become one of the biggest challenges the world

How to protect the environment has become the world's greatest mystery

How protects the environment to become one of world biggest difficult problems

How to protect the environment has become one of the world's one of the greatest difficulties

How to protect the environment has become the world's greatest mystery