Trees are very helpful and important for us. （樹對我們人類是多麼的重要和有用。）We should plant more and more trees in order to live better and more healthy in the future. （爲了將來我們的生活過得更好、更加健康我們應該種更多的樹。）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。）作