李婷重新拿起手帕，缘于一项关于环保的调查。
The reason why Li Ting began to use handkerchief again is an environmental protection research.
例如，日本馆就让我懂得了许多关于环保的知识。
For example, Japanese mansion helps me understand much knowledge about environmental protection.
本校将举办关于环保的英语演讲比赛，以迎接世界环境日。
Our school will hold an English speech competition about environment protection so as to welcome The World Environment Day.
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