有些句子相當有用,盡量減少語法錯誤,)it’s everyone’s duty to love and protect the environment.(愛護和保護環境是每個人的責任和義務,以環保話題,trees are very helpful and important for us. (樹對我們人類是多么的重要和有用, 盡量圍繞環保展開主題,比如:(過渡句)the most important question in the world today is pollution .(當今世界最重要的話題